I have used Oceanic, IO, Kent Sea Salt and recently Red Sea Coral Pro. Kent was the best hands down with regards to my corals reaction to water changes. All of them have issues with ALK
not being acceptable, needing ALK
additions to balance them out. I experienced the most cyano
with IO, Oceanic was the easiest to mix. My personal testing (and I mean buckets, not just a few water changes of each) has shown me that Kent Sea Salt is the best overall with Oceanic a close second. IO is great middle of the road salt and I will *never* buy another Red Sea salt product again in my life. Red Sea is completely unreliable, inconsistent and mixes like concrete.