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will any filter or heater or light work? how about air stones. and is their salt water food?
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It depends on what kind of salt water tank you want to set up. If you want to do a fish only with live rock (FOWLR), you can get away with less filtration...I have an aquaclear HOB on my tank, for example. You can also just use standard lights for a FOWLR. However, if you want to keep corals, you need to start upgrading the equipment. Lighting, in particular, needs to be much stronger for reef setups. And the lighting set ups for those tanks gets real expensive, real fast. You do not need air stones for sw. Yes, there is different food for sw species.
Check out this link for equipment you would need to start out:
http://www.fishlore.com/SaltwaterAquariumSetup.htm