Mine are in the middle of the tank with light-meduim current and it bloooms huge "15 heads", and my hammer at the bottom indirect current and it blooms well. Too much current cause them to rip from the stem. Very low current cause them to bloom big but won't split as fast. Low- meduim if possible is the current and on top under metal halide would be best in my opinion since I breed frogspawns and hammer to sell to LFS and recently to MAast and ARC peeps, I have a three head splitting to 9 head for sell if your looking for a frogspawn. Stop breeding and focusing on SPS since I'm now addicted!!!