Help! I don't know why my Green Spotted Puffer is sick!
I have a Green spotted puffer and his water is brackish and up to temperature. He won't eat, his neon green coloring has dulled down and he is hiding his spots on his back. His stomach is dark, and he is hardly swimming. His tail started to look like it was getting fin rot but I added a bit more salt and gave him a little medicine and his tail is doing much better, but he still looks like he's on his death bed. I'm not sure how old he is but he's maybe 2 inches long, no more. I'm doing everything I can to try to help him but he's just not looking any better, please help! :(