first of all... Great pics. I love that eel on the powerhead as well. As for the aptasia, two routes... One is to shut off all current in the tank and gently shoot in some joe's juice directly on the head and hope to minimize exposure to desireable coral. Or, take the rocks out and put them into your other tank with peppermint shrimp til they are eaten. Myself, I would risk the juice. :-)
-Doc