First, welcome to R2R!!! You will need some type of filtration and likely some type of lighting. I'm assuming that you are asking about a saltwater tank. What are you planning to keep in your tank (fish, corals, etc.)? Is your tank drilled - in other words, does it have a hole in the side or bottom of the tank for plumbing to go to a sump?
I encourage you to read the following R2R article to help you get started:
The Supreme Guide To Setting Up A Saltwater Reef Aquarium Introduction The marine environment is one of the most complex systems on the planet. The aquarium you are about to set up is only a tiny sliver of the vast ocean, but it is nowhere near simple. This task is going to take patience, a...
www.reef2reef.com
#WelcometoR2R