I plan to have a 20g. I am thinking of getting 20lbs LR, 25lbs LS, a penguin 125 filter, a small flow pump, and either 65 watt PC or (2) 24 watt T-5. The PC has more watts but the T5 has 2 bulbs so one can be actinic. Which would be better. I have heard people say that LR is enough filtration...