ok i got a 45 gallon tank and hand made stand from my aunt and uncle for a wedding present and i didnt get any thing with it. what do i need? how do i get the hole ecosystem going? i just wont a simple tank for now. i know i need gravel, filter (but what kind would be best), heater, and i have read that in some cases you need air stones some you dont witch one is rite? i know i need a lite to. any help would be great thank you