no at this point I'm guessing its just bad water quality. Since I don't know the parameters I can't rule that out and I can't give medical advice on the situation. put pictures of the fish up here if you can.
I say right now your best bet is water changes and a little salt in the water. No meds yet.
Ok I'll change the water and with some salt and yea I'll post the picture.can u tell me y is he bending while swimming. His tail is downward.