Looks like he is a little constipated. Do you feed exclusively on prawns? If so then that might be the problem. I alternate between algae pellets and prawns with my tusk and he's doing really good. For now I don't think there is much you can do but wait it out. Just keep your water extra clean to be on the safe side. They are quite hardy once established and those parameters you have shouldn't have much affect on the condition.
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