Too many variables to comment. How long did you own them ? Some stock at our local store have been very weak other have been very good (there is one particular distributor from florida that has always delivered very strong stock to this store and they label the tanks when they received cardinals from this distributor). Another issue could be temp (cardinals like warm water - and are more sensitive to cold water conditions than some other tetra); water condition; ...
If these were recently purchased and everything else is good in the tank then it could be poor stock. One of them looks pretty beat up but maybe that is the angle of the picture.
also 20 fishes in a 20 gallon tank is a bit excessive (presuming your tank is listed in aquarium detail) so the water might be rather unclean.
When I said new i did not mean 'new birth' but new to you. I think you said you had them for 12 hours so in that sense they are new. I normally try to make sure the shop have a fish for at least a few days ( a week is better) before purchase as a lot of fishes can be stressed due to shipping.
As I mentioned my local fish store receive cardinals from several sources. This summer one of the sources they suffered more than 50% mortality but another source they had less than 1% (I think they told me 1 out of 400 fishes died).
I don’t think they’re that young. They are well above .5”. But I’ll try to call them good call.
No all of the fish were in their tank since friday. They all seemed fine. I had one that stayed away from the pack once put in the tank. So I figured he would go. I hope that the rest survive until I make it home from work. As long as the rest survive I'm happy. It will be 24hrs around 230-3. So hopefully the rest survive
They look awfully red to me, but maybe it was tweezers. I know they are dead, but my dead fish never look like that overnight. Why were they caught in the tank that you had to remove them with tweezers?
So you had your GF dose with Prime after the 4 deaths?
Definitely update once you test the tank. I hope the others are ok.
That was what I thought also they look red. They were all down in the bottom by the plants. I would have ripped all the plants up grabbing them. And yeah I asked her to dose with prime incase it was an ammonia spike. I am so upset I didnt have time to test the water before work. I'm stressed out about it ugh.
Yeah, I get that. I've been in the same sitch where you just have to go to work and then you are worrying all day. I know this doesn't really help, but worrying will accomplish nothing but stressing you out. Your GF has dosed Prime, so if for some reason there is an ammonia spike, it should alleviate the toxicity a bit.
When you get home, test the water, if the is more than 0.50ppm ammonia, do a 50% water change to get that down to 0.25ppm. And try NOT to worry!
Did you do a large water change before adding the fish? I was thinking there'd be a lot of nitrates if you didn't. Still wouldn't cause redness though or deaths overnight.
But only 4 dropping from ph shock I think more would. Like I said I'm going to do a full test. But if it was ammonia my tank should process it. I had one stay away from the group from start so I figured they wouldnt make it. But I feel like I would have another few dieing if it's my water issue since 9am. But I'll dig into the tank as soon as I walk in the door. And she will turn up lights and get another pic when she gets our son from school
As heartbreaking as it is sometimes this just happens. The ones you lost may not have been as strong as the others. These little guys go through so much getting from the breeder to us. Often the weakest ones just can't handle it. We can do everything just right and still some don't make it.
I know you made sure your tank was ready for fish and you acclimated them to your water so you did all you could to give them the best chance possible. Keeping the lights low while they settle in is a good idea.
Yea that's mu thoughts. I just worry they looked pretty red that it might be ammonia burns. The rest this morning seemed fine. Nice blue and red. As long as none pass away while I'm at work I'll chalk it to a few weaker ones. If not I'm in trouble have 3 more fish coming in the am. Thinking about getting some safestart plus just in case it was ammonia. But cycled to 3ppm I dont think 17 juvie cardinal will cause an ammonia spike.