Only one in the tank and the lighting isn't strong at all. I have a fluorescent T8 and over the anemone or whatever it is a marineland double led. I don't have anything but live rock in the tank and wasn't planning on growing a reef in the 55. I have a 25 that is separate from the 55. I have a 10 gallon I could break the live rock its on and grow it in the 10. Be interesting if it turns out to be a rose bulb tip or something else.