20 gallon saltwater, Penguin biowheel 200 filter, Fission nano-skimer, non-adjustable heater
Don't overstock your tank. Ive had my tank for about 2 years and have had to redo some things due to overstocking. If your new get a non-adjustable heater it makes maintaining the water temp. easier. Saltwater is as easy as freshwater along as you have time to maintane your tank and saltwalter is somewhat more expensive to do so than freshwater.
Purple Brush Gorgonia, and the clam has various corals and sponges groing on it.
"The way out is through"
I started out with a beta in a fish bowel and eventually i got my 20g tank. It was originally freshwater but i soon changed to saltwater because of the variety it brings.