Bloated fry

[Never too many fish]

I have 5 bronze corydora fry. Oddly enough 3 are twice the size and more devolped.
I have them in a 2.5 gallon tank with a bare bottom and a few larger stones. I do a large water change daily and empty and wipe the tank out every other day.
This morning I noticed 2 at the top of the tank. 1 bigger one and 1 smaller. They both seem to be very bloated. They also have visible bubbles inside them. The larger one died an hour ago and does still have a bubble inside him. Any ideas? Pics are of the same fry that passed. They are definetly on the inside of them.

 

[MaloK]

While frequent water changes are generally good for fish, they can be problematic for fry. Try reducing the frequency to every other day or even every 3 days. Let the water sit before to help gases to escape.

It can cause bubble disease. This occurs when the water is supersaturated with dissolved gases, such as nitrogen or oxygen. The fish absorb these excess gases, which form bubbles in their tissues.

These bubbles can block blood flow and damage organs, leading to death.

 

[Never too many fish]

While frequent water changes are generally good for fish, they can be problematic for fry. Try reducing the frequency to every other day or even every 3 days. Let the water sit before to help gases to escape.

It can cause bubble disease. This occurs when the water is supersaturated with dissolved gases, such as nitrogen or oxygen. The fish absorb these excess gases, which form bubbles in their tissues.

These bubbles can block blood flow and damage organs, leading to death.

While frequent water changes are generally good for fish, they can be problematic for fry. Try reducing the frequency to every other day or even every 3 days. Let the water sit before to help gases to escape.

It can cause bubble disease. This occurs when the water is supersaturated with dissolved gases, such as nitrogen or oxygen. The fish absorb these excess gases, which form bubbles in their tissues.

These bubbles can block blood flow and damage organs, leading to death.

Thanks! I will definitly do that.

 

[MaloK]

If your standing water container creates micro bubbles sticking on the wall, stir it from time to time to make it vent faster.

 

[GaryE]

This tends to be a winter thing, as cold water holds more gases. I've never seen that though, with a bubble inside.

Cory group fish breathe surface air, and extract it via their intestine. They exhale through their butts, and I have seen those bubbles gracefully rising to the surface many times. Air inside the fish is odd.

When it gets into the -25 range, I don't do water changes, but we shouldn't be there yet.