Lost Coral Beauty to Ick- next step?

[Lorna]

Hi just started up a 55 gallon saltwater tank in December. I have 2 clown perculas, 3 chromis, 2 cleaner shrimps and various snails and crabs. I added a Coral Beaty 3 weeks ago and lost him to ick last week. I tried the garlic and the cleaner shrimp did their bit and I used a product that my LFS recommended - Ick treatment by No Sick Fish. All my other fish are fine, but what do I do next? Do I assume that I still have ick in the tank?