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Not all aptasia are created equal, or wear the same face. I've seen many colorful aptasia as well as translucent ones. Call it what you will, aptasia or majano, it is certainly one of the pest glass anemone's and not desirable addition.
Rock anemones such as that one is Aptasia. Majano anemones have tendency to mimic the bulb anemones where Aptasia have longer cone shaped tentacles. In any case, they can reproduce quickly, sting and wipe out anything in their path. Use Joe's Juice to get rid of them. It is a sad thing to buy corals and watch these little guys sting them and kill em...
Also a true Curly Que has cork screw type tentacles..