I bought 4 Dwarf Sunburst Platy's 4 days ago. 2 of them had some fin damage, so I started Melafix in my QT on all of them. This morning they all have cotton patches and clamped fins, and are pooping long, clear stringy yuckiness, and shimmying in place. LFS said the Pimafix would work well in combo with Melafix in getting rid of internal and external parasites,bacteria, and repairing the chewed fins.