I'm new to this so some of my answers may be considered generic. Tank was purchased from a friend in January and I used his water. I have the VHO Lighting 10k .. 2 white and 2 blue bulbs. I test water with kit.. PH, ammonia, nitrates good... And to be safe every time I go to store I take water sample and they confirm good parameters. 75 gal, one 1200 power head and one 750 power head plus he had one that turns slowly and not sure of its rate. I do put a cap full of fusion 1,and fusion 2 every couple days to keep calcium and alkalinity right... This was recommended by store.....they test good too when I take sample in...