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To update this thread I have added a small sandbed of 1mm coral sand and the RCW is bedding down in it O/N. The 'hunting' behaviour before lights out has gone and is replaced with the more usual inquisitive searching about the tank that I see during the day. The sand may need topping up and I have a bit of an issue with suspended grains but I get this with broken down live rock anyway (which is finer). Thinking about using a some polyester floss in the sump or maybe carbon reactor. So, RCW definitely seems happier.... thanks for your advice Cancun and pfan151
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