This is a discussion on Internal parasites within the Tropical Fish Diseases forums, part of the Freshwater Fish and Aquariums category; -->
I think my kissing gourami has internal parasites he is slowly getting thinner and thinner. What should I do.
I have used prazipro without any negatives, but it doesn't treat ALL internal parasites so it may or may not be effective.
Levamisole treats all internal parasites, but you won't find it in a "fish" formula, if you can find it at all. I think some bird medications would be your best bet. The med paralyses the parasite, so that the fish can pass it.