Hi, I'm using Pimafix to treat a little fungus in a Platy on a 30g tank and I'm in the third day of dosage (15ml or 5 per 10 US gallon) and she has almost nothing at all. Now the instructions are for 7 days and then a 25% water change. Is it really necessary the 7 days? If so could it harm any of my fish? (Pearl & dwarf Gourami, rummy nose, harlequin rasbora, praecox rainbow, albino cory, platy, pleco, algae eater). Any experiences are welcome! Thanks in advance!