Thanks for the help. I think my aptasia have reached major proportions but oddly enough only in half my tank. I have a slightly more powerfull powerhead on the opposite side so maybe it keeps the new ones at the opposite end.
I have tried the lemon juice injections but I can only really get the big ones that are exposed and my problem is with many, many small ones. I'm afraid that whatever I try is going to stress them and they will all start to multipy like crazy - then what?
Sounds like I have a struggle ahead, that there's no easy way so I guess I'll try to keep hitting them and stay ontop, hopefully.