I have them under 400W 20K SE XM. Single bulb over a 58 gallon tank. I feed them a slew of different things, cyclopeeze, mysis, krill, chunck of silersides. I actually take about 3 to 4 colonies/frags out of the tank and float them in a tupperware in the sump. I fill the tupperware with water enough to cover the corals and saturate the water with food. Let them float for about an hour and put them back in the tank. I turn off all pumps in the tank when I put them back in an feed the rest of the tank so no one tries to take the food from the micros.