I have tried a few different types and I like elos the most, by far. I did notice my colors more rich than usual. After a month though, my PO4 shot up and my nitrates were a lttle higher as well. I do not know if that was due to my reefkeeping or the aminos as I know a few other sps'ers that liked them as well. I also have heard good things about the aminos by warner marine.