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You should treat your whole system. Don't turn the return pump off. I had an emerald crab make it through the treatment because I couldn't get him out, but I could tell it affected him, so it had to be pretty bad.
Thanks for the advice, I've been reading that every part of the system needs to get treated so I'm going to revise my original plan to treat my whole system. I'm going to my vet tomorrow to see if I can get some sentinel instead. I read that snails and inverts without an exoskeleton do ok, but crabs, shrimp, and pods get desimated. I have a whole bunch of macro algae I can pull out of my fuge for a little while then put it back. About how long after running carbon can the crabs and stuff go back in? Do you think it will effect my carpet anemone?
You will most likely need to order the spectrum online from Australia, which your don't need a prescription for. I ordered some for dipping new frags... it took about a week to show up.

