I went to the LFS
and asked the clerk "Do you have any T12 24" 20 watt bulbs? I want to get some 10,000k" She proceeded to point to 18mm tubes. I said "Aren't those T8's? They won't fit my ballast." She said "Look the pins are the same, they fit just fine." So I bought 1 to try it out before I bought more.
Well... it worked fine this afternoon, but when I got home from work it wasn't working anymore. Now, the ballast doesn't do anything at all. I had 3 normal bulbs and 1 18mm. I can plug the bulbs into a different ballast and they are just dimm... but if I jiggle them around they start working.
I soooo wanna kill someone... this REALLY sucks. I had planned on getting live rock soon but I can't afford a whole new light system AND the rock.