Hi, thanks for your help guys, you really helped me out. But now I'm more confused than ever. 3 different lfs good stores told me that around here you can't do mh's in a house unless it's air conditioned! And my house isn't! They all said that I would have to go with a hanging system, or get a chiller if I went the mh way. My tank does run a little warm in the summer, but I just change up the light schedule and cut back a little, and no problems. They all said a 55 gal isn't large enough to do so, and not enough heat displacement. So then I looked into VHO's and was gonna do that and get 460 watts of that -4- 48 inch bulbs, but then I read a couple places it's half the brightness of pc's so now what?!!!! DANGIT Thanks in advance, ANY advice would be helpful. Thanks, Alison