Im starting a 40 breeder and I can't decide which fixture I should get. I will be keeping Lps and sps. The fixture i will be getting is an aquaticlife t5 4 or 6 bulb fixture.I've heard that a 6 bulb fixture on a 40 breeder is to much but I don't want to have to upgrade my lighting later on if I go with a 4 bulb. Any help would be much appreciated.