Just to inform you all that my 2nd Helios ballast crapped out after only 2 weeks. Hellolight.com even said that they were going to stop carrying them and that they will give me a full refund. So I have 2 options now, maybe this is my chance to upgrade to MH's or get a 4X96 PC retro kit and add it to an ABS canopy. If going with the MH option, I was considering 2 175W bell shaped pendants, one for each side of the tank, but my LFS said that I would cook the tank from overheating. My tank is 20" tall Which would be the best option? I know 4X96 would probably run cooler. Please advise!!