If it is an amphipod or copepod then the benefit of it to his system would be minor if any. On the other hand if this is some kind of nudibranch then the damage to the system can be substantial.
I personally believe in am aggressive deep of any coral entering my system. Farther more I recommend my friends to do afresh water deep to the frag bases. I started doing it after I hade a flatworm plague in my reef tank and eventually I had to take all the rocks out and wash them in fresh untreated water.
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