Hi newmarine, and welcome! If I remember your other post, one of your corals is a Dendronephthya species. Before you wait too long, I would see if your store you bought it from would take it back for some store credit. You (no one) won't be able to sustain it in your tank.
Oceans has given some good guidelines, but there are exceptions to every rule, almost. Oceans' inch/gallons might be more appropriate for fish only tanks. I would say a safer guide for fish/gallonage is 1 inch for every 6-10 gallons, if you also have corals. The newbie section on this sight is a great place to start. If you can answer the following question about a coral, you are ready to buy it?
Where does it come from on a real reef?
What lighting does it require?
What do I feed it?
What kind of water movement does it require?
Is it compatible with other corals, fish, and invertabrates in my tank?
Can I purchase the same coral, farm-raised (propagated) instead of wild caught?
One question I have, what is the "built in" filtration on your tank?