I would take the rock out at all cost to remove them with brush. Is ok to piss off other coral for a little bit because if one of these got into your sump then you never can get rid of them.
I put NO/POX on a doser, when I stop using it my nitrate will rise. I only dose like 1 ml a day so it’s not really a big deal. I test nutrient every week. I will post my parameter as well