I have a 55g setup and I want to add more light. I purchased a setup from the LFS that included only a single 40w florescent and I have obviously need for more light. I have been reading everything I can find and looking over many previous posts and just want to make sure I know what some of the shorthand means. VHO (Very High Output), MH (Metal Halide) PC = (Power Compact or also Compact Florescent) am I right so far? OK now for the ones I am iffy about what is NO and LOA mean. Also I was gliding through the lighting section at Loews and came upon 48" florescent aquarium grow lights are these any good? They are obviously not as bright as a 40w white florescent. Is there any good source that explains what each light is best and what combinations work well? I didn't want to mortgage the house to get MH lights so I was looking at doing the PC lights. Currently I have a 55 predrilled with tidepool sump 70 pounds mostly cured Fiji from Premium Aquatics purchased two weeks ago already starting to show signs of growth even under that piss poor 40w florescent. One of my issues my stand is the new modern stand and hood from All Glass. The hood is nice and tall but the opening is a little restrictive on lighting options. I was looking at mounting the PCs inside towards the back 4 - 13 watts if I can fit them on each side with maybe 2 - 96 watts in the middle. Will I need a fan? I really love reading about everyone's setups and look forward to being able to post photos when mine is mature.