He had this tank up and running for 3 years I think. Please do your research. It's impossible to be successful in this hobby without doing your due diligence beforehand. Good luck, and, when you do make the leap, be sure to document your tank's progress on here!
Easiest way to get started is with a Bio-cube all in one for around $300. Using your Freshwater tank would involve some equipment purchases that would add up $.