I've had good success with the boiling water; I used a small-guage hypodermic to deliver it right into the perch. I had a single aiptasia that was quite small for a long time, and no new growth. Then my coral banded shrimp was sold out of the tank, and suddenly I had four of them growing quite large. The boiling water zapped 'em good, with no regrowth. Of course, YMMV. I've come to believe that the CBS was pruning them.
Matthew
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