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Ok thats pretty cool! If something does happen or not all of the critters were picked up, I would like a crab if possible or really whatever is left at that point.
I would say that matted filefish could get rid of them naturally. I also recommend aiptasia eating nudibranchs. it is the only thing they eat so they will definitely keep things in check! One thing to note though, the filefish might eat the nudibranch so if you're going to do both, do it with...