Originally Posted by hornemadness
Would you suggest then putting them on something that would go above the top of the viv? I'm just trying to avoid having something on top of the tank adding to the height of the whole thing.
Putting them on top works okay. You don't need much in the way of height -- just something rigid to mount them on (anything flexible will tend to bend as they heat and cool with on and off cycles) -- a piece of glass would work; something like a strip of aluminum might be better, as it will tend to conduct heat away from the strips.
I'd recommend leaving at least a half-inch of airspace between the strips and the top of the viv, to allow air to circulate and cool rather than transferring into the viv (or cooking the LEDs); you'll also want to insure that there's a bit of air flow around the fixture for the same reasons.