If you use Joe's juice you have to use it properly. To many people just point the syringe at the Aiptasia and blast away. A couple of days later the little sucker is back.
Turn off all of your pumps so there is no water movement. Then slowly drip Joe's over the Aiptasia so that they don't close up. You can actually see them start to ingest the stuff.
When they get a good mouthfull they will close up right away but by then it's too late.
I've done it this way a bunch of times with 100% success.
