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Actually my acro does...and just one. This little guy is hilarious; every time I have my hands in the tank cleaning, etc. he waves his claws around to let me know that the coral is his domain and to stay away.
Tank Description: 125 gal w/ 5in DSB, 3x175 watt MH, 2 x 160 watt VHO, 30 gal refugium, 20 gallon sump, Tunze 9015 skimmer, 2 Koralia 4s, 1 Koralia 3, 2 Maxijet 1200s on wavemaker
They are known to be sps coral eaters. As they get larger they can hunt sleeping small fish, snail, hermits.
Notice any loss of tissue around the coral it hangs out by?
No I havent seen any loss of corals. My corals are actually exploding with growth.The crab has gotten to be the size of a emeril crab and looks just like one only brown and fuzzy. He hangs out in a cave at the bottom and I never see him on any of the corals days or night.
Not all fuzzy crabs are problematic, but picture to help ID it would be helpful. As Prugs stated, a parasitic crab will damage its coral host by eating the polyps in the area it has set up shop. You may still have good coral growth overall, but the area where the crab lives may have damage.
Tank Description: 125 gal w/ 5in DSB, 3x175 watt MH, 2 x 160 watt VHO, 30 gal refugium, 20 gallon sump, Tunze 9015 skimmer, 2 Koralia 4s, 1 Koralia 3, 2 Maxijet 1200s on wavemaker