Aquarium substrate such as live sand or crushed coral. Some go bare Bottom, others choose the 2-3" bottom, others, more advanced will try the Deep Sand Bed, which is over 6" deep.
Dry Rock, there are a few hitchhickers onLive Rock that people want to stay away from, so they opt for using Dry Rock, or Dead Rock. Macro Rock is a good place to start looking for that. Either way oyu go you will need a minimum of 1lb per gallon
.Aquarium filter (not absolutely necessary if running with adequate amounts of live rock, but nice to have if you need to use a mechanical filter or activated carbon, etc.)
Replacement filter media like filter floss and activated carbon (if you get a filter)
Multiple Powerheads (2 or 3) 10x your water volume for just a Fish Only With Live Rock, and at least 20x your water volume for a Reef Tank. So lets say your going reef, and you have a 100g tank, you would need flow in that tank at minimum of 2000gph, or 2 1000gph powerheads.
Protein Skimmer, rated at 2 times your water volume
Saltwater Test Kits. Reef Test Kit. Tets for Ammonia, Nitrites, Nitrates, PH, Phosphates, Calcium, ALK and Magnesium.
Saltwater fish food. Mysis Shrimp, Squid, Cyclopease, Algae Sheets, Romaine . Flake food is not really a good food to feed your marine fish.
Aquarium vacuum. This one is iffy. Most don't use one, if you have enough flow in the tank you won’t need one
Rubber kitchen gloves
Aquarium glass cleaner, for cleaning the inside glass
Two, clean, never used before, 5-gallon buckets
Aquarium thermometer, digital being the best.
Brush with plastic bristles (old tooth brush) - needed for cleaning the live rock if you don't get Fully Cured Live Rock.
Power Strip, possibly GFCI outlets by the tank.
Optional but definitely recommend getting a Reverse Osmosis or RO/Deionization filter for the make-up water, and a barrel for storing the water.
Heater rated for your size tank.
Possibly a Quarantine Tank for your new fish. They sit in here for a few weeks to kill off parasites and bacteria, to keep it from getting in your main tank
Marine SaltAquarium filter (not absolutely necessary if running with adequate amounts of live rock, but nice to have if you need to use a mechanical filter or activated carbon, etc.)
Saltwater Hydrometer or even better a Refractometer, which is more accurate.
Last edited by Reefing Madness; 12-02-2011 at 11:44 PM..