01-06-2010, 06:18 PM
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Most people add a CUC before fish and corals. They benefit the system in many ways, by keeping the sand stirred, doing preventative algae control, and eating detritus that settles onto the rock. A CUC is very valuable in a reef system.
I personally do not use a CUC in my FOWLR tank, simply because many of my fish would consider CUC to be food. However, in a reef, there is really no reason not to have a CUC.
As far as what is safe, you will generally not have problems with snails, hermit crabs, and shrimp. Some complain of hermits being opportunistic predators, and there is something to say for this, but I have never had issues when food is added daily.