My betta began having a growth behind and near his gill about a week or two ago. I normally am on the monsterfishkeepers site, and posted about it there, but at the time he was acting normal (feeding a freely swimming) and they said it may be a tumor and if he is acting normal, then dont worry about it.
Now, the growth has become large and he is crashing on the bottom, hides in ornaments, and isnt feeding. It appears it is affecting the gills function as well.
Now he is having trouble swimming, and is basically just laying on things, and looks dead (not yet but he is probably very close.) Others have seen this picture and have suggested it being a tumor, or mabye fish TB.
What is your opinion, and how should i treat this as well as the rest of the tank. The other community fish are guppies and platys, in a 55 gallon.
I forgot to also mention, the growth started above the gill area, but wasnt actually on the gill like it is now. About a week into it (as you can sort of see on the first pic) his belly began swelling and looked as if it had some sort of internal growth as well.
He has been in this tank with these fish for almost a year now.

Now, the growth has become large and he is crashing on the bottom, hides in ornaments, and isnt feeding. It appears it is affecting the gills function as well.
Now he is having trouble swimming, and is basically just laying on things, and looks dead (not yet but he is probably very close.) Others have seen this picture and have suggested it being a tumor, or mabye fish TB.
What is your opinion, and how should i treat this as well as the rest of the tank. The other community fish are guppies and platys, in a 55 gallon.
I forgot to also mention, the growth started above the gill area, but wasnt actually on the gill like it is now. About a week into it (as you can sort of see on the first pic) his belly began swelling and looked as if it had some sort of internal growth as well.
He has been in this tank with these fish for almost a year now.
