WCs don't help with nitrites in the long run, you've gotta figure out what's causing them. It basically boils down to the filtration being unable to cope with waste in the tank, whether because its' too new media, not enough, too many fish, too much food, etc.
How big is that tank?
Also, why the oxygen stones? All your fish are airbreathers...unless you are using it to help clear excess carbon dioxide to prevent the water becomeing too acidic (carbonic acid)
How big is that tank?
Also, why the oxygen stones? All your fish are airbreathers...unless you are using it to help clear excess carbon dioxide to prevent the water becomeing too acidic (carbonic acid)