I have the same light on a 20, and am getting excellent growth from many species of softies (at all levels in the tank) and "easy" SPS corals like Montipora. I have no room for LPS, so I've never tried them, but I would think they would be fine in your tank. You might have to put them higher in the rockwork if they fail to thrive. Clams that don't need as much light, like hippopus or squamosa, will probably also be OK, but they are species that will get big.