Im looking for a UV light filteration to help kill bacteria. The thing is I want a small one for a 20 gallon, maybe about half the length of most traditional heaters. Price is a issue as well, not lookin to spend more then 60 bucks on one. I know this may be overkill but I like a clean bacteria tank, heck im even considering puttin another 5-10 gallon filteration system on the opposite side of my already 20 gallon filter.