mr funktastic
Aquarium Advice Addict
u should look for 2 ballast rated at 4X48". most ballast are load sensing so u dont need to worry about the size of bulb u use. just wire up 3 from each ballast at 30" and u are set. this will make the bulbs run cooler and therefor more efficientyl. still wouldnt hurt to have a fan on one side if u can do it.