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Hi i have elegance coral in about i month, first week its work excellent after that i don't know what happened , the problem is all the time close you can see the pic below . tank information : pH=8.2 no2=0 no3=40 ammonia=0 sg=1.024 temp.=25-27 calcium=468 magnesium=1200 Attachment 218287

http://www.youtube.com/watch?v=R1wQv89O6SY