its been 2 years, I was doing things on my own, and doing what the LFS said and costing me alot of $. On day I was in a LFS and was talking to a sales person and they were trying to sell me something, dont remember what now, they said it was good and I needed it for my tank. I said I would think about it, the sales person went and helped someone else and another person came up and told me dont get it because it was not good for your tank and told be to check out some reef board on the net to get the true answers to what you should put in your tank before you buy. That was 2 years ago.