Well if your going to add a u.v. you really can't get much smaller. It may add a few degrees, you could run it just a few hours a day to prevent that and save energy, if it were me I'd take a look at this post http://www.plantedtank.net/forums/di...terilizer.html (Plumbing a Portable UV Sterilizer)
and consider doing that, thats what I'm in the process of doing. Even if you only have one tank you can us it "as necessary" and if you get more or have more tanks it'll save you money, or time swapping tanks. My two cents.
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