I always just remove the clam from the tank in a bucket of aquarium water then scrub or scrap off any aptasia or majano that I see with a tooth brush or blade. Afterwards I return the clam to the tank and discard the bucket of water. There were 5 or more aptasia on the derasa that I picked up from BWA but at least with a large smooth shell they were easy to get at. I've also left the clam in a QT tank for now so that I can wait and see if anymore pop up.
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