20 gallon aquarium
cover w/light
100 watt deluxe heater
digital thermometer
Challenger 1 air pump
10 feet air line tubing
6 airstone
Penguin 160 power filter
20 lbs. crushed coral
25 gallon sea salt mix
Seatest hydrometer

Here's a general list for a 20 gallon. I honestly don't think you need that many airstones though. Keep in mind that tanks weigh 8 pounds per gallon plus supplies. Even a small ten gallon, which can't house many saltwater fish, can weigh over 100 pounds, so you need to make sure the shelf it is on is stable. How big is your tank?