I have a 29 with 2x65 and I just don't get the color out of the zoos in that tank as I do in my other tank with high output (HO) T-5s. If you haven't purchased the light yet, I would suggest getting T-5s (If I had it to do over, that is what I would do). If it is in the budget, go with 4bulbs as this will allow you to keep most anything SPS,LPS, etc. if you want to later.