Can anybody recommend one? I was just about to get Wormer Plus then realised that it says that it is not safe with inverts. I can't really treat the fish separately as I don't have a large enough tank to do it in and would imagine that trying to catch all of my fish to move them and treat would be a very stressful business and so may be counter-productive. Have had Preis Coly recommended to me, but it seems to really target internal and gill parasites whereas wormer plus targets internal and external (ie not just gill) parasites. Fish are presenting with shrunken bellies despite eating and are flicking so I want to treat internal as well as external.