That sounds like a nice project and in the meantime you can read up and research saltwater tanks and get a better grasp what you will need.Well, i was thinking fake corals...
I already started making the AMAZON RIVER BIOTOPE in the aquarium...
i am thinking about doing a small 5-10 gallon nano coral tank with like 2 clown fish (hopefully breed them?)
Some clownsfish have been captive bred but I'm not sure if it has been achieved in home aquaria yet.That would make for a neet project too.