I’ve posted this before... peppermint shrimp. In the 5-6 years that I’ve had a salt water tank I inherited aptasia on two separate occasions. First time a few years ago I tried aptasiax. Aptasia stayed. Bought a few peppermint shrimp... gone. Last month an aptasia came in on the plug of a drag I bought. Bought a single peppermint shrimp, it’s all they had. Next morning gone. 2-0 in my tank.