Like any trigger they are hit and miss as to reef safeness. Nigers are, however one of the better ones: upturned mouth = plankton eater. I have a Blue Chin Trigger, also a planktonic feeder and he is a model citizen. IMO corals should be safe but shrimps, crabs may be taken. If you keep them well-fed there is usually less chance of this.
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225g reef
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