Okay, the tank is 100 gallon and it is 5 feet long (60") and I am having a very difficult time finding a 60" strip. I can either go 48" or 78", but obviously the 78" is too long. I am trying to achieve 2 to 3 wpg, enough for plants to survive with low to medium light without Co2 injection setup. I buy bulbs at PetSmart, but I think they are T-8 bulbs. Right now, I have 2 strips of 20w 24" 6,700k bulbs. I might not keep them, since I do not think the reflector are good on them. If I don't keep them, then I'm looking at a fixture that have 3 or 4 bulbs, but not too much wattage. If I keep them, then a fixture with 2 bulbs. These kind of bulbs are better than compact double tubes? I don't know where else to find a good fixture, so if anyone can, direct me to good suggestions, please. Edit... Found one for 60" but extremely expensive.