Try a monti digi, buy a purple one and if in a month it stays purple, you got your answer... I would not try acropora species, they really need intense lighting, again, maybe a digi, monti cap, pavona cactus, perhaps a stylophora, and maybe even a birdnest/seritipora, you could always try... I would be looking for your next investment to be in lighting before livestock though, be surprised how cheap you can get a halide on the local forums... GL