i think a general rule of thumb with saltwater is go big or go home lol...if your nervous about keeping saltwater, id start small. 40 gallons is great. get a few smaller fish to start. You'd be surprised at how much experience you can gain, just by starting small. id recommend some of the typical fish. Clowns, smaller wrasse, cardinals, chromis etc... after a while, you'll feel more inclined to make the decision on being ready for corals or not. good luck.