I have an orbit marine on my small 27g cube tank and I agree with what others have said. IME, it is not really suitable for anything requiring moderate/high lighting and with a deeper tank. All I have are some mushrooms and a few green button polyps and they do ok. I haven't used it in combo with any other fixtures, but I imagine if you added something like kessil 150s or anything else higher powered, you probably won't even need the orbit marine at all. (A single 150 has as much power as the 3-4ft orbit marine.)