I used instant ocean because its all my LFS had when I started up my tank. Since then I noticed my friends corals were growing at a rate of around 5 or more times to mines 1 unit of growth... He uses reef crystals, so I switched and it works really well for me. For a solid month or so my little piece of some kind of orange cap didnt do anything at all, finally attached to the rock, after my first few water changes with reef crystals its already 20% bigger. Fosters has reef crystals 160 gallon bucket for 5$ more than my LFS sells the 50 gallon bag for... 32$!