A few months ago one of my chalice frags suddenly began to recede while the other one continued to grow under the same conditions. It took me a while to discover a small gorilla crab living very close to it and to remove that crab. Once I did that the recession stopped and the chalice has been begun to slowly recover.
Some threads on here have recommended giving liverock a dip in club soda or something which will cause any hitch hikers to evacuate immediately. That would probably be a better way of doing things instead of smashing the rock.
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