I also have an MH question. How do you tell when your MH needs to be changed. We bought our setup used, so do I wait till they burnout or is there a way to look at them and know when to change them? Also, what type and wattage should i get for a 125 gal reef tank (it's about 6' x 24x24)? The setup is 2 MH and 2 flouresents (1 blue & 1 white).
Thanks