I lost one of my fish today to an illness.

Now I'm obsessing over my other fish. Gilligan is acting normal, although he has never had a big appetite and doesn't make bubble nests as often as Gollum did.
Can anyone tell from this low-quality picture if he looks healthy? I'm sorry I don't have a better picture, but my camera can't take good pictures through the water.
PS. I just realized that his color looks different in this picture. His body is the same color as his tail, and the paler area under his chin isn't as pale as it looks here, either.