I hate to dig up an old thread but having a bowfin myself, I'd like to ask... will simple treatments every so often of melafix be a problem to this species? I like to do preventative stuff. I do 20 percent water changes every so often and the tank has ample live plants and proper lighting. My bowfin is always so shy by never passes on shrimp and live minnows. It's tank mate is a (now thought to be) Florida or spotted far and a small 2 inch brim. For now it is a 55 gallon tank. Soon going to a 3k gallon pond outdoors.