Ich parasites can attach themselves to inverts but they don't get what they need from them to survive - food. Without a host (fish) the Ich will be starved out after 8 weeks. You can keep your inverts in.

Can hermit crabs carry ich?

Ich can hitchhike on just about any surface including a hermit crab shell.

Do sea urchins carry ich?

Well-Known Member. Short answer: Yes, it is possible, but far less likely than coming in on a fish host.