Oh YES, You can smash some fresh garlic and soak it with the fish's favorite food for about an hour.
If you don't want to deal with the smell, you can get Kolyic (sp.?) water base garlic from any health food place and do the same thing. You will notice the tank getting better in a couple of days.
I have been feeding my sailfin Kyolic soaked food for 3 weeks since it was getting ich. It ate the same foods ( Formula one, brine shrimp frozen zooplankton and flake0 regardless if it was soaked or not. Now I am six days into treatment with kick ich. For one day I thought it looked close to death. Now it looks much stronger but still has lots of spots. The kick ich seemed to clear the ich the first two times I added it but now it looks like it not going to cure it. So far the corals look OK. I am afraid to leave the skimmer off for the full two weeks of treatment so I have only been leaving it off for the first night after an add. If the kick ick fails I will set up a twenty gallon as a quarantine tank. I am afraid the shock of changing it to a new tank will kill it so I decided to try the garlic and Kick Ich first.
Yes I have sucessfully treated a sailfin tang that had ich with garlic extract. You can buy the stuff from a health food store but make sure it unflavoured.
Soak the food in garlic extract for half and hour and feed. If you change the food continue with the garlic exclusively.
JOHN D I am interested on what it says on the label. Is it 100% garlic extract? What size bottle and what price did you pay?