Critter #3:
I know for a fact this is not aiptasia (I had that in my last tank), but I am not sure if I should kill it. It really looks like an anemone of some sort. Friend or foe?
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I think Critter #3 might be aiptasia, but I am used to the brownish kind. This one is clearish. Friend or foe; who cares. It isn't particularly cool looking, so I won't miss it if it was a friend.
I'll blast it with some Aiptasia X.