I need 2 know what i need to put in my new tank 4 chemicals.Its a 30gallon tall and i want it to be salt water. some 1 gave me salt in a little carton that came from wal mart.i dont no if thats the right stuff.what else will i need?what else do i need besides the filter also?some one please just give me detail on how to start a saltwater.thank u!!