Posted: Mon Jan 14, 2008 8:39 pm
The UVB will travel some distance but the further away you go the weaker the UVB is.. most the time UVB bulbs are flourecent eaither compact light bulbs or the long tubes...
but on a 20 gallon tank i think you should be fine having one on each side.. the UVB will help light the water up aswell just have it aimed at the basking dock with no obstructions... a cheep clamp lamp is about 8-12 dollars buy 2 of them
one fixture with a regular house hold bulb above a basking area
one on the opposite side with a UVB compact bulb pointed at the basking area as well..
that should work till you need to upgrade the tank
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