Someone help? I used to have 4 oto in my tank but 2 died and 1 went missing (most likely dead too but I couldn't find the body in the tank), so I pretty much have just this one oto left.
Anyway, last few days ago, I noticed that my oto has gone really fat, before the belly was just plump but now it's so round and bulging I'm really worried. There was one time when I saw it pooping a really long brown poop, that's gone past it's tail. I thought maybe before it was just constipated and now after that long poop the belly would decrease in size...but it didn't and it seems it's gone fatter.
I don't know is it because the oto has just got a lot of food available for it to eat and it's gone fat, or has it got dropsy?
Here's a pic of the long poop:
Side and bottom view of my oto: