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+1 on that.
Adult Engineer goby I hope your rocks on sitting on the bottom of the tank, and not on the sand. They will knock over your rockwork by digging...
If I remember correctly, they are in the genus Anthopleura. Depending on which species it is, some can get over 10"s and consume anything that...
+1 on flatworms, yellowtail damsels work great on destroying them. if you have a lot of them, flatworm exit should be your next purchase.
Places like that are called "chop shops"...
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