<a href=showthread.php?s=&postid=10547050#post10547050 target=_blank>Originally posted</a> by rcypert
Im not so sure. 216 watts on 75 gallons of water does not sound so good. Everyone is going to hate me for using this formula but 5 watts per gallon is a good starting spot. Your at 2.88. Now I have not had the chance to use T-5's I hear they are hot stuff. But I would not trust any of my corals under that low wattage in such a large tank. What kind of reflectors are you going to use? If your not planning on using individual reflectors you should reconsider your lighting plan. You have to get the most out of those bulbs if your going to use so few. Also if you dont change your bulbs on a very precise schedule you could also find yourself in trouble. All in all it could work just monitor your corals very closely.