I was thinking of doing a FW dip of the rock and hold a big net under it, so when any HH come running out of the rock, they will fall in the net and I can lift them immediately out of the FW and put into the SW. Would that work? Or would they die too quickly?
That has been my only idea so far, but if anyone else has any ideas, I'd be really happy to hear them!
My only other thought was to take one rock that only has 2 visible aiptasia on it and nuke those and put that rock in as an "island" so if there are any small undetectable aiptasia on there, they can't move onto the rest of the rock. But then, I just don't want to risk transferring in any of the algae or aggressive macro that is in my current tank.