Anyone have a T8 bulb they prefer? I'm specifically looking for a 50/50 type bulb that I can get in an 18" length, I haven't used too many and need to replace some bulbs on a few tanks, I really don't like the stock Penn Plax blubs AGA (now Aqueon) seems to use. I may just get Coralife bulbs, but I'm not too keen on using CGP products.