my picasso trigger does the same. where he likes to sleep in his little cave, is bare glass, he'll removes many mouths full of sand daily and make dust storms in the tank. all the live rock is covered with sand.
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tanks:
120g w/starphire front, pm bullet 2 skimmer, yellow tang, emperor angel, niger trigger, spotted hawkfish, blue tang, flame angel and 120lbs lr
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