@bevo5 My Atlantic Boue Tang had Ich for a few months when I finally decided to try Polyplab Medic because there was no way I was catching him or him surviving in a QT. I did the full treatment with the max amount of dosing and after the 20 days I didn't see any improvement. But after a few weeks my tang was completely free of Ich. So the product definitely works, didn't damage/hurt any of my corals, just need patience. Check out my Instagram @coopsreeftank and you'll see all the updates and progress I posted throughout the treatment. But I live and die by Polyplab products, so I highly recommend trying out Medic. Again, be patient.