When I first set up my tank, there were Aptasia. A friend got some pepermint shrimps from the jetti and gave them to me. I put 12 of them in my 450 g tank. They just wipe out the Aptasia population. After sevral months, I trapped them and release them back to the bay. My tank have being Aptasia free eversince. (3.5 years).
Minh Nguyen