Update - Last night I shut down the pumps and probably went through 5 - 6ml of lemon juice in a syringe. All aiptasia retracted and withered. When I turned my pumps back on 2 or 3 large ones totally detached from the rocks dead. Looks like it worked but I'll continue to monitor their growth...
All the fish are fine and eating so the lemon juice didn't upset anyone...
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