Yes but, For a first time venture into the "Dark Side" it would be very difficult.You could only keep some snails and maybe a small Goby and would have to check water parameter daily.
The Eclipse filter would be good enough and you would need 3-5#'s of liverock and a little sand. You would more then likely have to do a 10% water change twice a week. A tank that small can go bad really fast.
I would recommend a larger tank in the range of 20-30 gallons to start.
You would need a good liquid test kit (API is a decent one), a Refactometer to montor the water parameters as a Hydromenter( the cheaper one) is not good enough for a tank that small, Sea salt, RO
water and lots of patience as nothing good happens fast in a saltwater tank.
PS: you would also need a light, a compact flourencent light with a Kalvin range of 6,500k or higher.