I use Red Sea blue bucket. I switched from TM Classic and have been happy so farI've been running mine at 7.0ish (tropic Marin pro) and the SPS seem to like it, still continuing to base out, no vertical growth as the tank is still young. Only gripe is that you have to stay on top of supplementation since there's very little room for error. Might switch to Red sea blue bucket for slightly higher alkalinity so I don't need to test as frequently and just let it drift till the next water change.