I would not use it on the frogs! I have used Quick Cure for years (actually dosing my tank right now) and have found that it hammers Amph's and Crusty's. It works really well for Ick and Protozoan parasites like Costia. Be careful of staining though...the stuff stains quickly in its concentrated form. I haven't had too much trouble with it staining the silicone. The carbon will remove a lot of the formalin and malachite green before it has a chance to work its magic. Hope this helps answer your questions.
