I just ordered these lights for my 20 I'm setting up. I was going to go with a 250 watter but got a decent deal from a guy upgrading to a bigger tank.
Coralife 24 Inch Aqualight Pro, 1x150W HQI MH Lamp + 2x65W PC + 2x1W Lunar LED (24in )
Coralife 24 Inch Aqualight Pro, 1x150W HQI MH Lamp + 2x65W PC + 2x1W Lunar LED (24in )