I run 2 96watt actinics 12-13 hours a day,then 2 96 watt 10k flourescents come on for 10 hours. My metal halides 3 175 watt run 8 hours during the middle of the day. the tank is 150 gallons, with11 fish the two largest are a yellow and a blue tang. I feed them once a day. About a cube of frozen mysis and a 1/2 cube of something different every evening.