Hello i have 4 fish that have suddenly become non active and resting on the bottom of the tank. I have checked all my water parameters and everything was normal. They are not gasping for air or doing anything else abnormal.
I did a 35% water change just to see if anything would change but still the same. This is going on 3 days now.
Tank is 120 gal and i have a good canister filter and a large power head so i dont think its an oxygen problem.
I stopped feeding them the day i noticed this happening becuase i know this type of thing is common with over fed fish. I dont over feed so dont think thats it either.
Are my fish all just being lazy?
Can anyone think of anything?