IMHO yes, and I would never run a reef tank without one.
Mine is mounted horizontally under my tank.
The main thing is to be sure it's always full of water, if your pump turns off the UV does also.
I would look at the manufacture's web site to see what size tank it's rated for, the proper flow rates, and proper mounting.
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Pete
"I never make mistakes...
I thought I did once, but I was wrong"
Current Tank Info: In the process - http://reefcentral.com/forums/showthread.php?t=2661614
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