i have had SW fish for over a year now and i have been very lucky with all of them untill now..i have never had any illnesses with them..but i set up a tank for my daughter cause she loves fish..well most of her fish have ick..lost a few of them. and a couple i still have medicating them in the hos. tank..my question is do inverts like crabs or shrimp,or featherdusters get ick? because that's all thats in her tank right now...just wondering...thanks for answers in advance..:thm: