Molly Is Thin And Tail Is Drooping...

[alexbryan]

One of my Mollies was really, really bloated a few weeks ago, and I was worried she was going to die. The bloat went away almost overnight after I treated the tank with internal bacteria medicine, and for a few days she seemed fine, but she's become quite thin now, and her tail looks kind of bony and is drooping. She's not really swimming about much, she just stays at the bottom of the breeding cage we're keeping her in while she's poorly. The only encouraging thing is that she's eating fine again, which she wasn't when she was really bloated. All the other fish in the tank seem fine.

What do you guys think might be wrong with her?

 

[WILDER]

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.

How old is she as they can go thin when there getting old.
Has she just had fry.
What does it look like when she goes to the toilet.
Check her anus to see if its enlarged or red and inflamed.
Bloating can also be a sign of internal parasites.