Waterlife Research I Waterlife Protozin Whitespot / Fungus 500Ml

I have a 75 gallon tank that I set up in January 2014 with 8 mollies and about 20 platies. By late 2015, the tank was severely overstocked with 60 platies and about 30 mollies (they did this themselves), even though in a year's time I had given away easily 150 fry. So in November I got a 60 gallon, and I set it up for my platies. I added 9 small cory cats. It has live plants and runs a Magnum 220 canister and a Tetra Whisper 40 filters. Despite my best efforts, about 10 days ago this tank had a severe and rapid ich outbreak. On Friday they were asymptomatic. On Sunday I woke up to 8 dead platies and 7 more died soon after. The survivors had varying degrees of infestation. So I pulled the sickest fish, about 15, and I put them in a running 15 gallon I keep reserved for hospital/quarantine. I turned the heat up to 82, added 1 tsp salt per gallon and treated with Protozin. I did the same for the 60 gallon. I shut off the Tetra Whisper. I shut off the Magnum 220 for 1-2 hours after dosing, but left it running otherwise. I know carbon absorbs medication but I couldn't risk an ammonia spike to already sick fish. I had no more losses and everyone recovered. My plants did fine and Protozin didn't stain the sealant and gravel the way other malachite green products do. I've used other malachite green products and this one seems to work the best.