Again, good information to know. Thanks Steve. I was told about the technique by Mark and Cat but forgot to ask how much to use (which is why I have held off entirely to date). Maybe I'll get lucky and one of them will chime in. If not, I'll send a pm. I had assumed it was a very small amount. It gets injected with a syringe into the aptasia. I like the idea of this because it is a pinpoint attack and the areas that I need aptasia removal are in my 27 gallon Kuda tank and on various zoa/paly frags. The ones on the frag plugs are really small. I've tried aptasia x but, it doesn't seem to work and it usually gets on at least one polyp causing problems.