i need to now what do u need for a salt water tank (every thing)

A good start would be reading through all the threads in this section. Most of your questions have probably already been covered. If you have specific questions after that then we'd be happy to answer them for you.

thanks but also what size tank is good i planned on getting a 100

I agree, read the threads...they will be very helpful....

A 100 gal is a great tank... a six foot tank like a 125 is better if you are going to go that large!!!