I burnt two SPS frags to a crisp trying to keep my alk up at 12 where the black bucket salt mixes at. One monti cap and a stylo. LPS seems unaffected. Let the alk fall to 8ish and SPS is doing great. I just have to be really careful with water changes until I switch to blue bucket. Im also running ULNS, no dectable NO3 or PO4. I dose the Red Sea energy A and B daily.Yeah, that pro salt is similar to AF pro biotic, needed for uln systems.