05-19-2013, 08:30 PM
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Someone sent me to take a look here at what's going on. I'm a molly person. LOL
Let's see, there's a few problems I can see that'd be causing problems for your molly.
First one, and most likely cause is stress. You added stress zyme to his tank in the hospital tank and he perked up, yes? That will help, and it shouldn't hurt your other fish either. =)
You have the wrong group sizes going. Most tetras like to be in groups of 5-6+, mollies and cories are the same in that regard. They don't like being with less than four of their kind ESPECIALLY in a tank with fish like Angels, I'm not sure I'd trust that myself. It can get them very upset and cause messy, odd poo, loss of appetite, even loss of will to live, they get depressed and all that as well. With fish like the angels who could be seen as predators, it wont help his self-esteem any without a group to flee back to.
How is your water hardness? If the hardness is too low, this tidbit was given to me by Byron, it can cause them to become lethargic and even cause fungal infections. Mollies like nice hard water.
The other problem is that he's a balloon molly. They're naturally less hardy and very inbred, more than most mollies. They can get problems like constipation and back issues, who wouldn't? Swimbladder problems and eye problems are also high up there for them, as well as a pitiful immune system among other things(I think they're kinda cute and all, but they're the least hardy and most prone to problems of any molly I have ever owned). They also prefer brackish water over fresh, if you're able to do that for him, I'd suggest another tank set up, a nice twenty gallon and a couple girls. You may want to give him a piece of a cooked, skinless pea to eat every three-four days or so(just a small bite), I found that helped keep his system in order, they get constipated so easily! And any schooler will get depressed without tank mates.
Before you consider more mollies for him though, if you do, check your water parameters with what they need and make sure your other fish can handle them. If everything is set for all, I would consider getting him some placid females and no other males, that may make it worse. =)