Need Some Help, Quick

[PetsGoRound]

Hello, I have been keeping fish for a LONG time. I have a 125 set up with 5 Frontosa's in it. 2 large canister filters and 3 powerheads. It stays at 80 degrees. They all normally stay hid most of the time. Today they were all up at the top of the tank gasping for air. I added another powerhead thinking that one of the canisters was cloged up a bit and I would clean it tomorrow. When I got home from work one was dead.
What could cause this. I have never had this happen before.

Please help

Thanks

 

[jschall]

Hello, I have been keeping fish for a LONG time. I have a 125 set up with 5 Frontosa's in it. 2 large canister filters and 3 powerheads. It stays at 80 degrees. They all normally stay hid most of the time. Today they were all up at the top of the tank gasping for air. I added another powerhead thinking that one of the canisters was cloged up a bit and I would clean it tomorrow. When I got home from work one was dead.
What could cause this. I have never had this happen before.

Please help

Thanks

Check nitrites... apart from that, I can't think of anything.

 

[packer43064]

Hello, I have been keeping fish for a LONG time. I have a 125 set up with 5 Frontosa's in it. 2 large canister filters and 3 powerheads. It stays at 80 degrees. They all normally stay hid most of the time. Today they were all up at the top of the tank gasping for air. I added another powerhead thinking that one of the canisters was cloged up a bit and I would clean it tomorrow. When I got home from work one was dead.
What could cause this. I have never had this happen before.

Please help

Thanks

What's your water changes like. Get an airstone in there ASAP for now.

 

[swede]

CO2 will do this. Ammonia levels being high will too. are their gills red?

 

[swede]

correction: improper levels of CO2 will do this, since it takes away from oxygen supplies