Cory catfish keeps swimming to surface and is running like crazy

[RainGamma]

He just started to do this. He stopped but I’m wondering why. I’m going to send a video of it I just got him. I have two right now but going to get more. It’s a 20 gallon long and it’s fully cycled

 

[RainGamma]

 

[RainGamma]

Don’t worry I’m changing the gravel to sand

 

[RainGamma]

Also how much of Cory Julli should I get for my 20 gallon long?

 

[Colin_T]

Corydoras regularly take air in from the surface to breath and help their buoyancy.

If the fish is doing it regularly (several times a minute) there could be a water quality problem or low oxygen levels in the water. Check the ammonia, nitrite, nitrate and pH of the water. Increase aeration/ surface turbulence and see how they go.

All Corydoras do best in groups of at least 6 or more of their own kind. I think a 20 gallon long is 2 foot long and that should be fine for 6 Cories.

 

[RainGamma]

Corydoras regularly take air in from the surface to breath and help their buoyancy.

If the fish is doing it regularly (several times a minute) there could be a water quality problem or low oxygen levels in the water. Check the ammonia, nitrite, nitrate and pH of the water. Increase aeration/ surface turbulence and see how they go.

All Corydoras do best in groups of at least 6 or more of their own kind. I think a 20 gallon long is 2 foot long and that should be fine for 6 Cories.

I’m pretty sure my water is fine. I think it’s the brown algae as people say that it steals oxygen from the fish I scrubbed most of it off but I gotta do more. I can increase my filter

 

[RainGamma]

Corydoras regularly take air in from the surface to breath and help their buoyancy.

If the fish is doing it regularly (several times a minute) there could be a water quality problem or low oxygen levels in the water. Check the ammonia, nitrite, nitrate and pH of the water. Increase aeration/ surface turbulence and see how they go.

All Corydoras do best in groups of at least 6 or more of their own kind. I think a 20 gallon long is 2 foot long and that should be fine for 6 Cories.

I can’t check the Ph right now but I will when I can. I’m going to take it to the pet store to check it out.

 

[Colin_T]

algae uses carbon dioxide and produces oxygen when given light.