Does anybody have any ideas of what this may be? Please help

[3linked]

i have a reef tank that I recently started, I have a sailfin tang, blonde naso, blue hippo, and a pair of clowns, I purchased them all recently.. I noticed a few days ago that my sailfin was breaking out with little spots on him, as I investigated the rest of my fish I noticed my naso was getting black spots on him as well, my initial though was I had acquired ich, it's been several days now and it's progressively getting worse, I started soaking the food with garlic guard and treating with a reef safe solution but it doesn't seem to be getting better, my fish are still active and eating well so I'm beginning to think it is something else, I will attach a few pics and any input would be very appreciated.. Thanks

 

[ThRoewer]

From the pictures I would say it's ich all right.
It's getting worse because effective reef safe medications don't exist and all that is sold as such is just snake oil.
Garlic is only good if you want you fish to die of liver damage.

The only thing that helps is to transfer all fish into a clean quarantine tank of appropriate size. With only one QT your best choice would be treating the fish with Chloroquine Phosphate (New Life Spectrum Ick-Shield Powder).
Other methods that work well are tank transfers (TTM) or hyposalinity. Though TTM requires at a minimum two QT setups and hyposalinity can be tricky for beginners.

Also your display tank needs to stay fishless for 11 weeks if you want to be sure the parasites are gone.

 

[thax]

First how big is your tank to be adding that many tangs at one time? Also never add that many fish when you frist start a tank. As to the ich pull all fish with that many tangs you will need a good sized tank or 2 Chloroquine Phosphate works good if you can only do 1 tank and might give them relief a tiny bit faster then ttm