A rock I placed into my sump months ago had a single aiptasia on it which I left alone for whatever reason. In the past few months I've seen a few show up directly on the glass in the same compartment. It's only when I get super close and really stare at the sump and single rock that I can make out a ton of these things you normally can't see. My thinking is for every one we go after (having spotted it) we have a bunch that are so tiny you can't really detect them at all. For this reason I truly believe that once infected you are then maintaining levels (either manually or with preds) not fully eradicating. For this reason I would think that while this could be effective you'll never beat the problem as tiny impossible to see offspring are all over.
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