Please help! Ich

[copenhagen_cowboy@live.co]

I have a 77 gallon display tank with a 50 gallon sump tank so about 100 gallons of acuall water. It has only recently been setup but using well a stablished live rock from my previous tank and more I bought from someone else. The tank is stocked with corals, crab, snails and shrimp as well as one fire fish, two clown fish and a medium size regal blue tang. The tang I bought with the live rock and I didn't remember seeing them before but today there's white spots all over her. I have added ich attack today which says it is reef safe for corals and inverts. It is a all natural product it claims. My other fish seem fine. What else can I do? Should I be trying to get her out and into a 5 gallon pail with filter and heater and use a copper based med?