If you have purchased an established tank the ick probably came with it.
Don't add the medication to the tank if you have live rock, live sand,corals and invertebrates. The ick medication is lethal for Corals and invertebrates, it will aslo kill the good bacteria in your substrate and live rock.
I have ick in my tank, I know it is present....My fish seem to be resistant to it. They are happy and well fed. If something is stressing them they will show signs of ick. I have to agree with Snaz about the quarantine, it is sometime so stressing that the fish end up dying.
Do you soak the food in Garlic and Selcon? What is your nitrite level?
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Andy
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