In situations like this, analyze why you would want to switch? There are 2 basic reasons: 1) Cost and 2) Performance. Cost should IMO never be the prime mover in changing suppliers, but if you have a product of known and respected quality, offered at a really good price, then go for it! Performance is more important-are you having any problems with using Reef Crystals? Technically, there shouldn't be any difference between the two brands. I have heard of people getting a bad batch of Reef Crystals. I use them and got a 5 gal bucket awhile ago from my LFS for $35 which seemed to be a goodprice. They also had some brand I did not recognize for something like $20 for the same amount. That scared me away-why was it so much cheaper than the Reef Crystals. When I check levels in my Reef Crystals water before adding it during a water change, it's always spot on for calcium and PH so hey, it works for me!