I agree with EXO, BigAl, and leebca. Didn't mean to give any bad advice. When I encounter problems with ich or any other ailments I first check my water quality and see if there is something I can do to keep the issue at bay like a water change and strengthen the immune system of the fish. If I have to, I'll set up a quarantine system and use the "Curing Fish of Marine Ich" directions posted by leebca. However, I will only set up this system as a last resort to save the fish if possible. I really don't have the time to set up another system and play Doctor Aquaria for 6 weeks. I'm frequently in and out of town, and I doubt I would be successful with it.