brittel star losing hairs

55 gal newbie

New Member
my green brittle is losing the littel hairs on the legs they r falling off,he seems to be a littel on the weak side can someone help me?wateris ph8.2,ammonia0,nitrate0,nitrite0, he was in the tank for about 3 weeks,my crabs are fine and so is my yellow tang what could be wrong?
 
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