Not sure how many have tried this stuff nor can I say it is totally responsible for the results in my tank. I started using it every other day after lights out. Just 3 drops, suppose to help build the skeletal structure of SPS and LPS. Over 2.5 months I have seen some wonderful growth in all my stony corals. Of course my tank has been really stable now for months too which helps but I really think the AF Build is working too. It hasn't drastically affected my calcium but my fluorine did bottom out. I can literally see the SPS growth week after week now. It is little pricey but small vial last several months. Might want to check it out.

