No. Undergravel filters are on their way out (actually have been considered "old school" for a while) for saltwater tanks. They trap all kinds of "junk" under the plates and will eventually need to be broken down and cleaned thoroughly.
Most people have gone to the Berlin method of filtration. You can read about it here: http://www.aquariumadvice.com/showqu...q=2&fldAuto=10
In a nutshell, as long as you have enough LR
, good water circulation, and enough light, this is all the filtration you need.