Crabs

[Hanneman24]

I have a little debris in my refugium that hangs on the back of the aquarium. Should I add a blue legged hermit crab to the refugium, something else or nothing at all?

 

[Peace River]

What is the purpose for the refugium? To raise pods, filter/clean the water, both, or something else? The answer to this may help you understand what direction to go. You could add a small crab or snail, do nothing, or clean out the fuge as needed. Good luck with whatever you choose!