molly stock

Mollies seem prone to internal parasites. Before the hollow belly, did you ever see white, stringy or mucousy poop from these fish? If so, a gutload of parasites might have been the problem. Often, these parasites pass eggs in the fishes poop which other fish ingest and so the cycle goes on. I wasn't aware of a treatment for fish until recently when someone poasted this link which talks about the use of Flagyl (generic name is metronidazole) to treat internal parasites in fish. I was familiar with Flagyl, as we used to use it in the reptile shop in which I worked years ago as part of a "shotgun" treatment for new specimens we either bought or collected. In reptiles it is not at all uncommon to treat for a variety of issues as a prophylactic measure, but many people dislike doing this to fish. The person who wrote the article says they did use it that way, however. I am still undecided if I would use it that way myself, as I have several fish that show no signs at all of parasites, but personally, I will not hesitate to use this treatment on any fish I have that begins to show signs in the future. I hope that helps.