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Yes they hid quite often and took 3 months to associate me with food before they became comfortableAmazing set up. Ive been cycling my tank for about 8 weeks while i was waiting to get my eels. Well, today they arrived. I ordered 4 but received 7. Tank is a red sea reefer xl 200 with 200 lbs of sand. Nothing in the tank currently. I have a large colony of gorganian I might put in there until I find some macro/grass for the tank. Did they hide most of the time after introduction?