Just make sure that if you are adding anything to the tank you can also test it to make sure you don't over dose and things are balanced.

Good luck with the coral it should be fine in a few days.

Sry if this sounds dumb but you have been feeding it chopped up food every 3 days or so right? Mine shrivels up if i dont feed him at least 1 time a week

It gets brine shrimp when I feed my sun coral.