Platy fry not growing?

mygerbilprince

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Female
Quarantine?
No, but I will try it.
List any water conditioners and test kits used:
API ammonia test kit
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5 to 10 years
Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
10g
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Freshwater Fish Only
Fish, Plants, Inverts, etc.
Guppies, platys, cory catfish
Aquarium Start Date
8/14/20
My platy fry are 4 months old but still, they don't seem to be growing. Maybe they are , very slowly that is. They aren't very active but once I change the water it usually perks them up for a few days. They are still no bigger than 1/2 inch (about 1 1/2 centimeters). They have shown no signs of gender and I'm starting to get concerned their growth is stunted. Is the "A fish won't grow bigger than its tank" true for baby fish? I have 10 fry in a 2 1/2 gallon tank. Is there anything I can do to encourage their growth?
 

BigManAquatics

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Male
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Brian
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Security for many places
Quarantine?
Learned the hard way
List any water conditioners and test kits used:
Inagitarium Betta Water Conditioner, API Tap Water Conditioner, API Freshwater Master test kit
Experience
4 years
Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
10 gallon
Aquarium Type
Freshwater Fish Only
Fish, Plants, Inverts, etc.
1 Rosetail betta, 1 Tiger nerite snail
Aquarium Start Date
August 2018
Temperature
80F
Aquarium Filter Type
Sponge
Aquarium #2 Size
10 gallon
Tank #2 Type
Freshwater Fish Only
Tank #2 Fish, Plants, Inverts, etc.
1 Veiltail betta, 1 Tiger nerite snail
Tank #2 Start Date
October 2018
Tank #2 Temperature
80F
Tank #2 Filter Type
Sponge
Aquarium #3 Size
10 gallon
Tank #3 Type
Freshwater Fish Only
Tank #3 Fish, Plants, Inverts, etc.
1 Veiltail betta, 1 Tiger nerite snail
Tank #3 Start Date
September 2020
Tank #3 Temperature
80F
They are probably big enough to go back in the main tank unless you have BIG fish in there. My wife tells me that platy fry grow better when adult hirmones are present in the water.
 
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mygerbilprince

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Aquarium Details  
Gender
Female
Quarantine?
No, but I will try it.
List any water conditioners and test kits used:
API ammonia test kit
Tetra Easystrips
Experience
5 to 10 years
Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
10g
Aquarium Type
Freshwater Fish Only
Fish, Plants, Inverts, etc.
Guppies, platys, cory catfish
Aquarium Start Date
8/14/20
They are probably big enough to go back in the main tank unless you have BIG fish in there. My wife tells me that platy fry grow better when adult hirmones are present in the water.
Oh wow very interesting... I have 2 cory catfish and a guppy (with a large mouth) as well as a snail in my main tank (which is a 10g) I fear the fry will get beaten up but I could test it out. Would they grow better if the adults were say... cory catfish that probably wouldn't attempt to kill them? I'm also afraid I wouldn't be able to see them since my tank is crowded with plants and decor. Do you think they would hide like they did when they were first born or would they be more active?
 

BigManAquatics

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Quarantine?
Learned the hard way
List any water conditioners and test kits used:
Inagitarium Betta Water Conditioner, API Tap Water Conditioner, API Freshwater Master test kit
Experience
4 years
Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
10 gallon
Aquarium Type
Freshwater Fish Only
Fish, Plants, Inverts, etc.
1 Rosetail betta, 1 Tiger nerite snail
Aquarium Start Date
August 2018
Temperature
80F
Aquarium Filter Type
Sponge
Aquarium #2 Size
10 gallon
Tank #2 Type
Freshwater Fish Only
Tank #2 Fish, Plants, Inverts, etc.
1 Veiltail betta, 1 Tiger nerite snail
Tank #2 Start Date
October 2018
Tank #2 Temperature
80F
Tank #2 Filter Type
Sponge
Aquarium #3 Size
10 gallon
Tank #3 Type
Freshwater Fish Only
Tank #3 Fish, Plants, Inverts, etc.
1 Veiltail betta, 1 Tiger nerite snail
Tank #3 Start Date
September 2020
Tank #3 Temperature
80F
Our platy fry are always pretty active but we never take them out of the tank and the adults pretty much ignore them once they can't fit them in their mouths. No guppy gonna fit them in its mouth. Nipped at, maybe, but the should be a-ok. The cories will probably mostly ignore them once they see not food pellets.
 

Flyfisha

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As of December 2020 I am changing 1100 litres per week in 30 smaller sized aquariums
To get fry to grow fast in any tank they must have fresh water often. In a 2.5 gallon that would be daily temperature matched conditioned water changes. In a ten gallon it’s still an advantage to change part ( 40% ) of the water two or three times.

I know this seems extreme but until you try multiple water changes for oneself in a fry grow out tank I would completely understand anyone who thinks this is hot air.
I did not think it would make as much of a difference myself until I tried it in my ten gallon grow out tanks.

It is said.
Fry release a hormone into water that that stops other fry from growing. This I believe to be true?
 
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mygerbilprince

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Aquarium Details  
Gender
Female
Quarantine?
No, but I will try it.
List any water conditioners and test kits used:
API ammonia test kit
Tetra Easystrips
Experience
5 to 10 years
Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
10g
Aquarium Type
Freshwater Fish Only
Fish, Plants, Inverts, etc.
Guppies, platys, cory catfish
Aquarium Start Date
8/14/20
To get fry to grow fast in any tank they must have fresh water often. In a 2.5 gallon that would be daily temperature matched conditioned water changes. In a ten gallon it’s still an advantage to change part ( 40% ) of the water two or three times.

I know this seems extreme but until you try multiple water changes for oneself in a fry grow out tank I would completely understand anyone who thinks this is hot air.
I did not think it would make as much of a difference myself until I tried it in my ten gallon grow out tanks.

It is said.
Fry release a hormone into water that that stops other fry from growing. This I believe to be true?
Thanks, I can try daily water changes. Any other input on fry not growing because of other fry hormones?
 

GuppyOverlord11

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Sometimes.
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Top fin water conditioner, API master freshwater test kit
Experience
Just started
Do you know of and understand the Aquarium Nitrogen Cycle?
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Aquarium Size
10 gallon
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black racer nerite snail.
Aquarium Start Date
January 2, 2021
Temperature
72-80
Lighting
Just the overhead light in the room
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Tetra Whisper
Aquarium #2 Size
10 gallon
Tank #2 Type
Freshwater Planted Tank
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2 male guppies, Guppy grass, 1 ADF, 2 Guppy fry, 1 black racer nerite snail
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March
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DO you have lights on your tank?
 

mimo91088

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Like mentioned lots of water changes help a ton. I've heard the hormone thing too, but ive never seen a scientific source cited either. It makes sense to me, but even if it isn't true you need to change lots of water. If for no other reason than water quality because you should also be feeding several times a day for maximum growth.
 
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mygerbilprince

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Messages
70
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Aquarium Details  
Gender
Female
Quarantine?
No, but I will try it.
List any water conditioners and test kits used:
API ammonia test kit
Tetra Easystrips
Experience
5 to 10 years
Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
10g
Aquarium Type
Freshwater Fish Only
Fish, Plants, Inverts, etc.
Guppies, platys, cory catfish
Aquarium Start Date
8/14/20
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mygerbilprince

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Messages
70
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26
Aquarium Details  
Gender
Female
Quarantine?
No, but I will try it.
List any water conditioners and test kits used:
API ammonia test kit
Tetra Easystrips
Experience
5 to 10 years
Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
10g
Aquarium Type
Freshwater Fish Only
Fish, Plants, Inverts, etc.
Guppies, platys, cory catfish
Aquarium Start Date
8/14/20
IMG_4314.JPG
So this is ok? she won't eat the fry?
 

Flyfisha

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Aquarium Size
As of December 2020 I am changing 1100 litres per week in 30 smaller sized aquariums
Sorry mygerbilprince, looks like nobody what’s to risk saying the adult fish won’t do what comes naturally.
One option is to add a couple of fry and wait 48 hours before you add any more.
 
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mygerbilprince

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Aquarium Details  
Gender
Female
Quarantine?
No, but I will try it.
List any water conditioners and test kits used:
API ammonia test kit
Tetra Easystrips
Experience
5 to 10 years
Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
10g
Aquarium Type
Freshwater Fish Only
Fish, Plants, Inverts, etc.
Guppies, platys, cory catfish
Aquarium Start Date
8/14/20
I don't know if I want to take that risk
 

Flyfisha

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Do you know of and understand the Aquarium Nitrogen Cycle?
Yes
Aquarium Size
As of December 2020 I am changing 1100 litres per week in 30 smaller sized aquariums
If those at the only fry you have alive in the last for months then the adults are eating fry 100% .

Don’t take the risk then.
 
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