I hope you plan to buy more of this after running out. I have been using up the last of the Reef Crystals I bought (as a newbie and didn't know better). All my water tests I have come out good, but I get VERY SLOW growth. In fact, my 3 head duncan has had three heads for about 5 months now. I'm thinking it's a salt issue and they're missing some trace elements they need. No more Reef Crystals for me!!