I have a 55 gal, with 2 T5 and 2 VHO, all 4 bulbs are 4 foot in lenght. I was always told to keep a clam you need the intensity of MH, I'm going to pick up a clam to try my luck with my lighting combo this weeek. I will post my results as they happen. I meant to go in today, but warm weather in Ohio meant I had to turn my house into Clark Griswalds with all the xmas lights...LOL....