Also, an Oddysea t5 unit is a big risk. They are the cheapest models on the market, and have caused several house fires. Google it, they are very real.
But besides that, depending on the type of coral you want you may need stronger lighting anyways. Also, that will determine how much flow you need in the tank. Soft corals need 20-30x tank volume turnover. Hard corals and SPS (small-polyp stony) need upwards of 50x tank turnover.
We need to know a little more in order to make sure you get set up properly.
