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I don't see that as being sand. See how there are spots on the fins themselves? That makes me think ich. The other diagnosis would be mucus plugs, but those arise from skin cells and you don't see them on fins like that.Don't they always breath fast being Hawkfish?
Hope it is just sand.
Have setup qt jic and to give him a respite from a dominant chromis who needs some time out to consider his attitude

