I needed one to control the aiptasia in my 100g. I tried 2 that did not live longer then 2 days. As a last try I got one from JnS a couple months ago and he is doing great. Any
fan worms in my tank were gone in the first day or so. Since then he does spend a lot of time pecking at the rocks and he comes out to eat any frozen food that lands on the rocks. There is still some aiptaisa in the tank, but it is no longer taking over. I never see him eat one, but before I got him the stuff was growing on everything.