I modified my JBJ 24g nano a few years ago and outfitted with a Coralife MH 15K/150W on the back of tank. I've had off and on issues with coral (sps and softies -- softies were always low in the tank). Right now, I have 2 acropora frags, 1 montipora frag, 1 toadstool and 1 ricordia. MY SPS...