If $ is there I would go with 400w with some actincs.good luck.I too am dealing with the same problem but $ is a problem if i rush it. my tank is 150g 72x18x29 I only want to keep soft corals , just keep it simple.could I get away with ho t5 lights if so how many could I go with. I was planning on going with 39in on each side a total of 6 to 8 bulbs 3 or 4 10,000k on each side and 3 or 4 420 and 460 actinics on each side. do you think that would work for me.