So I've been through ich before and have been reading a ton on ich. I used copper before and let my tank sit empty for 8 weeks. Dumb mistake landed me dealing with the ich problem again 2 years later. I decided to go with the tank transfer method this time having a purple tang and flame angel. I just finished my last transfer and thought I saw my bi color blenny itch against a decoration today. Any for sure way of telling if my fish are cured?