Is this Possible? (Please help!)

Yes. You will need a light, heater, and small powerhead. Include some rock and either a bit of sand or bare bottom (Don't use decorative gravel). If you plan to keep the filter I would run it empty and only use it for added flow. Stock lightly and keep up with weekly water changes.
 
Okay thanks; I had an outbreak of colonial hydroids and I am moving my two clowns. They were in a 10 gallon and were fine. I just wanted to be sure this tank was good enough to hold salt water!
 
If your ever woried about using something for saltwater for the first time...
You can always clean it out with Vinegar & Water. Make sure you rinse well. Only effect vinegar has in the aquariumis lowering the pH.
 
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