I just switched from Kent to Instant Ocean Reef Crystals. Not sure if I'm happy with RC yet (only been 2 weeks), but the magnesium/Ca/Alk levels are all higher than in Kent, which is a good think in my opinion.
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120 gal, 40 gal sump/refugium, 2x250w 10,000K Reeflux MH, 54w T5 actinic, ASM G4+ |