that all depends on whatyou want in your tank.
the lights you got with the tank are NO ( noraml output). if you want to run a tank with only live rock and a few fish and mainly inverts. ( shrimp and such) then what you have is fine. if you want to add corals then you will have to invest in a better lighting system. If you click on the sponors page at the top of hte screen you will find several lighing systems either DYI or full hood includeing pc , VHO , MH. a PC lighting system for your tank is not really that much money.
the other thing you should get is a few good books on reef tanks and the system for keeping them.
over all reef tanks are a wallet hurting hobby. but really cool to watch. as time goes by things will start to come out of your LR. some could take months before they come out. befroe you know it you will want a bigger tank..
as you look around the TRT website you will see tons of differant tanks and setups . everyone has a way to do it that works,but what works for me may or may not work for you.
you will have a blast with your tank! also invest in a good set of test kits.
live in a reef tank that is a 20Gallon is about 20 LBS. you are looking for a pound per gallon. there is a big differance between cured live rock and uncured. cured , you woudl get it from your LFS after it has beenin his system for a long while, uncured meansit can right out of the sea and in a box to your tank. there will be die off on that type. if you cure it in your tank you cpould lose everything in your tank. unless you place it in a tank by it self and change the saltwater ..
HTH
