Back in december i had a fish die of a mystery illness. He had no pine-coning or bloating but he lost his color and his fins looked damaged and would not heal back and he started getting sluggish.
I sanitized the tank with hot water and vinegar and moved one of my other fish into the tank and everything seemed fine up until recently where he started losing color and his fins would not heal. I put him into a hospital tank with maracyn and aquarium salt and still no signs of him getting better. I wonder if its something with that tank because my other betta is doing fine in his hawkeye and i have got them all around the same time. The other tank is a mini bow and unlike the hawkeye it doesn't have a shield over the light bulb so could that be part of the problem?
and does this condition sound familiar to anyone? He still eats but now all he does is lay around the tank when it isnt feeding time. The main tank is cycled although I don't really know the nitrate readings because my testing liquid doesnt change colors. I do a 50% water change once per week and keep the tank temps in the 75-78 degree range.