what else do you have in the tank??? if you do not have anyother fish in there I would treat them. if not move them to a QT tank and treat them. ich spreads quickly. garlic will help but it looks like they have it pretty good. I would get them treated ASAP
Garlic may or may not help! Since they are the only fish you have, Get em out. Get them in a 10 gallon tank using water from your main tank. Treat them with Coppersafe or other copper based medication! DO NOT USE COPPER IN YOUR REEF TANK! Inverts, Live Rock, Anemones and Corals will die from Copper. Get them quarantined now! I don't want to see them perish. Keep them in QT for 4 weeks to give the parasite time to die off in the main tank. It will die itself without any fish to host it. Do not medicate the main tank.
Any future fish you get Quarantine them for 4 weeks and treat with Copper as a precaution.
Garlic oil is just that, oil from a clove of garlic. By chopping a clove very fine and then squeezing the it with a spoon you can get some oil. Soak the fish food in the oil a few minutes before feeding. Garlic is thought to help boast the fishes immune system.
However at this point, I think it is too late for Garlic. As ReefNeck and Graphixx mentioned , you need place the fish in a QT tank and treat them with a Copperbased medicine.
Looks like Ick. Try feeding them some garlic oil mix in with there food. Also cleaner shrimp will help.
Cleaner shrimp can not clean ick off a fish fast enough. They will pick at a few and may help in prevention but can not get enough off a fully infested fish before the fish succumbs to the parasite and dies.
Wow, all I have to say is 1 of my clowns is quite smart. I got the first 3 out in about 2 minutes then I had to completely tear apart my aquascape for this last little guy. He was hiding in the rocks, under the rocks, behind the rocks, behind the powerheads and everything. He even made a jump for the overflow box as a last ditch effort to avoid me.
Finally .. I got them all in the QT where they are at now.
Now for the aftermath, aquascape destroyed, sand everywhere