I have a RSM130d and have been using Tropic Marin salt since the beginning. A buddy of mine just bought a RSM that comes with the starter kit and the coral pro salt, is this salt of good quality? When he runs out , should he stick with the same kind? Or switch to something like tropic marin?

Are you talking about Red Sea Coral Pro?
Some ppl like it, my experiences with it were negative.
I think regular Tropic Marin is better.
I use D-D H20 Ocean Pro and like it the best of anything I've tried.

Yea, red sea coral pro salt