Molly Fry Are Dying

So My molliy has given about 60 fry. They seems to be not very strong but they are swiming and eating. She gave birth to some dead fry too.
All thing is going well but in these days they are dying I don't know why but they are dying .. They sit on the bottom of the tank and they are swimming very less.

My other molly fry are all good nothing happening to them they are not dying, what is happening to the new batch?
The old batch is around 3 week old and the batch from which the fry are dying is one week old.

One more thing when they started dying I changed water but it doesn't help.

 

I’d look into velvet. This is a common killer of entire batches. Salt in fry tanks usually prevents velvet but I’ve never had an issue and never add salt for my fry.

It is also possible the fry are premature seeing as there were also dead fry being born.

 

What to do know? One batch is good other is dying. Should I add some salt ? Do regular salt can work?

I’d look into velvet. This is a common killer of entire batches. Salt in fry tanks usually prevents velvet but I’ve never had an issue and never add salt for my fry.

It is also possible the fry are premature seeing as there were also dead fry being born.

 

I still think because the mother held onto the fry so long, they could be damaged. If that's the case, not much you can do. Have you tested the water in the latest batch tank?

Since you have success with other batches, sounds like you know what you're doing.

 

I still think because the mother held onto the fry so long, they could be damaged. If that's the case, not much you can do. Have you tested the water in the latest batch tank?

Since you have success with other batches, sounds like you know what you're doing.

I don't have test kit. But I changed 50% water or 100% water in every 3 days. And but why they are dying after a week

What really happening is they sit on the bottom and slowly slowly they stop swiming

I’d look into velvet. This is a common killer of entire batches. Salt in fry tanks usually prevents velvet but I’ve never had an issue and never add salt for my fry.

It is also possible the fry are premature seeing as there were also dead fry being born.

 

I don't have test kit. But I changed 50% water or 100% water in every 3 days. And but why they are dying after a week

I would get a test kit just to be sure your tank is cycled and that you’re not having ammonia issues

 

But why only that batch is effected?
And please suggest me some test kit.

I would get a test kit just to be sure your tank is cycled and that you’re not having ammonia issues

 

I’m not sure why only one batch is effected but I like the API masterkit to test water parameters

 

I’m not sure why only one batch is effected but I like the API masterkit to test water parameters

They are dying now in very fast rate. How to lower ammonia if that is the problem I will solve it and please I want fast suggestion what can I do more than this

I think yoj are right premature or she held them for long time is problem

I’d look into velvet. This is a common killer of entire batches. Salt in fry tanks usually prevents velvet but I’ve never had an issue and never add salt for my fry.

It is also possible the fry are premature seeing as there were also dead fry being born.

 

They are dying now in very fast rate. How to lower ammonia if that is the problem I will solve it and please I want fast suggestion what can I do more than this

If your ammonia is high then you need to do a water change. Make sure your source water is at 0ppm too. In the mean time treat your tank with Seachem prime and use that to condition your water. It with make the ammonia non-toxic to your fish for 24 hours

 

If your ammonia is high then you need to do a water change. Make sure your source water is at 0ppm too. In the mean time treat your tank with Seachem prime and use that to condition your water. It with make the ammonia non-toxic to your fish for 24 hours

Hey HELP please.
My old batch is also effected. They are swiming very odd. Like they are tilting , spining and just too odd.

I am regularly changing water.
Look at video all are acting same even worse than this

 

Check water parameters. If you do not have a test kit, get one ASAP.

Do daily water changes as close to 100% as possible. If the problem is ammonia, that will keep it at bay. Use Prime too.

If there is a problem with the batch due to her holding too long, then I would just cull this batch and make sure the adult fish are healthy. It’s a Molly. You will have another batch soon.

 

Check water parameters. If you do not have a test kit, get one ASAP.

Do daily water changes as close to 100% as possible. If the problem is ammonia, that will keep it at bay. Use Prime too.

If there is a problem with the batch due to her holding too long, then I would just cull this batch and make sure the adult fish are healthy. It’s a Molly. You will have another batch soon.

I Think problem was ich or velvet. They are behaving abnormally swimming very odd. And I am changing water daily . So yes I lost my all precious fry

 

You could be overfeeding. Overfeeding is the biggest killer imo, I've lost whole batches before from that -snails in the tank are a good idea to clean up excess food, and do regular water changes.

 

You could be overfeeding. Overfeeding is the biggest killer imo, I've lost whole batches before from that -snails in the tank are a good idea to clean up excess food, and do regular water changes.

Two times in 24 hour

 

+1 to testing the water. That's your first step, make sure all the conditions and parameters are on. I believe Ich and velvet wouldn't be in the fry tank unless it was in the parent's tank. Also, I've never seen ich or velvet cause that kind of disorientation. You are using a water conditioner right? You should also really have an API master kit, especially if you plan to raise fry.

 

Two times in 24 hour

It's not so much how often, but how much.. They only need the tiniest amount, but twice a day is fine.

 

I started out with 8 molly fry and now I’m down to 6, loosing 2 isn’t a big deal I just don’t want to keep slowly loosing them all... they are just over 2 weeks old... is it normals for the weaklings to slowly die off?

 

I started out with 8 molly fry and now I’m down to 6, loosing 2 isn’t a big deal I just don’t want to keep slowly loosing them all... they are just over 2 weeks old... is it normals for the weaklings to slowly die off?

Interesting bc I had SO many I just gave a lot away. Some were older than others but I gave them away at two weeks (oldest—some were born that day I think) so I wonder how they’ll fare. AND more importantly, I found a few more the person missed when getting the other babies. Found them yesterday and they’re teeny like I think two days old. Three are very listless and the same coloring and one is a brighter yellow (so maybe a different mom) and is swimming about. They’re so tiny I don’t even see them able to eat tropical flakes crushed up and I would assume I’ll lose them except none of the other 68 died— YET it hadn’t been a full 2 weeks so perhaps some will pass. I kind of thought if they made it through the first days then they were okay.

 

Are they dying or just disappearing? Do you have them in a nursery tank? What are the parameters in the tank, what are you feeding them and how often are you doing water changes. Any information regarding the set up for the fry will help us answer your questions.

 

Are they dying or just disappearing? Do you have them in a nursery tank? What are the parameters in the tank, what are you feeding them and how often are you doing water changes. Any information regarding the set up for the fry will help us answer your questions.

they are dying, I have them in a glass bowl doing daily water changes, so I find them on the bottom dead. They are eating hikarI first bites and instant baby brine shrimp...

 

they are dying, I have them in a glass bowl doing daily water changes, so I find them on the bottom dead. They are eating hikarI first bites and instant baby brine shrimp...

So no filter and no heater? Fry are extremely sensitive to water conditions and parameters. I'd imagine this is what is causing the deaths. Most fry need warmer (and consistent) temperatures which a bowl cannot provide. Then not having any sort of filtration system means your bowl is likely in a state of constantly cycling because it is almost impossible to maintain a cycle in a bowl without a filtration system.

Can you put a breeder net in your main tank? This will be much better for them and may save some of the remaining fry.

 

So no filter and no heater? Fry are extremely sensitive to water conditions and parameters. I'd imagine this is what is causing the deaths. Most fry need warmer (and consistent) temperatures which a bowl cannot provide. Then not having any sort of filtration system means your bowl is likely in a state of constantly cycling because it is almost impossible to maintain a cycle in a bowl without a filtration system.

Can you put a breeder net in your main tank? This will be much better for them and may save some of the remaining fry.

Do you recommend the plastic box ones or the mesh netted ones?

 

Do you recommend the plastic box ones or the mesh netted ones?

Depends on what kind of tank you have I suppose. I have a plastic one that's nice and suctions to the side but the holes are bigger so tiny fry can escape. I prefer the nets if you have the space just because they have a finer hole in the mesh so no escaped babies

 

Depends on what kind of tank you have I suppose. I have a plastic one that's nice and suctions to the side but the holes are bigger so tiny fry can escape. I prefer the nets if you have the space just because they have a finer hole in the mesh so no escaped babies

I have a 35 gallon tank... I have read about some people saying their fry for strangled in the mesh ones when trying to escape but also like you said with the plastic ones sometimes the holes are big enough for the fry to escape

 

I have a 35 gallon tank... I have read about some people saying their fry for strangled in the mesh ones when trying to escape but also like you said with the plastic ones sometimes the holes are big enough for the fry to escape

I mean its a risk regardless, I have used both over the years and I never had the issue of a strangled fry in mesh. I'd imagine its like anything else you'll want to keep an eye out for loose threads and such and cut them as needed. That sounds like a pretty freak accident type thing to happen.

Try to acclimate them slowly to your main tank as they've already been super stressed from bowl life.

 

I mean its a risk regardless, I have used both over the years and I never had the issue of a strangled fry in mesh. I'd imagine its like anything else you'll want to keep an eye out for loose threads and such and cut them as needed. That sounds like a pretty freak accident type thing to happen.

Try to acclimate them slowly to your main tank as they've already been super stressed from bowl life.

How would I go about doing water changes on my tank with the breeding box hanging on the side of my tank?

 

I had mine in a mesh breeder and the small ones I hadn’t seen would swim up and hide behind it so they had cover too. I had a few females which is why so many fry. The new small ones are in a diff essentially empty tank and it has no sides to hang the nets off of so the fish are loose in the tank but not with predators. I prefer the nets bc they don’t have to hunt for food but you have a great question about water changes. Maybe put a rock in the bottom of the net to sink it down to the bottom of the tank temporarily?

 

How would I go about doing water changes on my tank with the breeding box hanging on the side of my tank?

I guess that depends on how big of WC you're doing. They're pretty tall so you can do a decent water change without worrying about moving them. As long as they still have some water to swim you can drop the level of the water quite a bit. I always just took the whole hood off and slid the breeder net to hang on the back side of the tank when I was cleaning.

 

I guess that depends on how big of WC you're doing. They're pretty tall so you can do a decent water change without worrying about moving them. As long as they still have some water to swim you can drop the level of the water quite a bit. I always just took the whole hood off and slid the breeder net to hang on the back side of the tank when I was cleaning.

I usually do a 60-70% water change. So I'll probably just slide the breeder net down with the water level

 

I usually do a 60-70% water change. So I'll probably just slide the breeder net down with the water level

Just be careful not to drop it as the tops are usually open. If your fry are bigger the plastic box may be a better option because some of them are designed to float so it would just sink as the water level goes down. Just watch it so it doesn't hit a decoration or something and flip

 

I have always used the net breeder boxes. No fry can escape through it. When doing a water change the net (breeder box will slide down about 4") after that I just move it by hand down further when doing water changes

 

I got a breeder net and now my adult molly keep swimming between the net and aquarium glass and getting stuck

 

I have a small breeder net that hangs on the side of my 29 at the top with metal brackets. For water changes, I just take a dishpan-like bucket, scoop underneath the breeder net (the other fish get out of the way) so I get tank water & let the bottom of the breeder net sit on the bottom of the bucket. They maybe have 3-4 inches of water, but it's fine for the 30 minutes or less that it takes to do a water change. Sometimes if brown algae has accumulated on the side of the net, I'll gently turn it & let the fry swim out into the dishpan, take the net off, rinse it, put the net back on, & reverse the process to capture them back in the net & put the net back on the side when I'm done. It seems like I always have molly fry & none of them die, though I'm sure some are eaten before I see them.

 

I put the 6 fry in the breeder net in my main tank (slowly acclimated them) yesterday. Today I did a water change and found one dead fry in the net and one missing(?) I can only count 4 in the breeder net...weird. Wondering if maybe one was small enough to swim through the mesh? Hopefully these 4 remaining make it

 

I put the 6 fry in the breeder net in my main tank (slowly acclimated them) yesterday. Today I did a water change and found one dead fry in the net and one missing(?) I can only count 4 in the breeder net...weird. Wondering if maybe one was small enough to swim through the mesh? Hopefully these 4 remaining make it

I don't know how high your water level is compared to the net but I'd check for holes or possibly it jumped. The dead fry unfortunately is a little expected from the shock of moving again. Keeping them in the tank tho is much better for them tho than the bowl they were in.

 

I don't know how high your water level is compared to the net but I'd check for holes or possibly it jumped. The dead fry unfortunately is a little expected from the shock of moving again. Keeping them in the tank tho is much better for them tho than the bowl they were in.

Water level is at least an inch above the top of the net. No holes/rips

 

Water level is at least an inch above the top of the net. No holes/rips

It'd possible it jumped, hard to say for sure. Not common for them to do it but most certainly not impossible.

 

It'd possible it jumped, hard to say for sure. Not common for them to do it but most certainly not impossible.

I think another one is dying...it’s just laying on the bottom of the net...it will swim away if I put my hand near it but then will lay on the net again

 

I was just watching my fish/fry and I’m thinking my bettas may be the culprit to the deaths/disappearances, I just watched one betta try to eat the injured fry through the net, so that leaves me wondering if the betta(s) are the one(s) killing them