OK, the new light looks great. I did a major renovation and got the tunzi rock and one 6100 in near the bottom of the tank. I tested it, made sure it worked and then stacked all the rock back up. The whole time I was smelling something burning. The ballasts? Warm, but not smelly. The new pump ballast whatever thing? No, not that. The light fixture, very warm, but not that. Went back to moving stuff around. Finally figured out what the smell was. My braces over the tank. They both got a little warm and are bowed up some. I'd say the light is a bit too close. It's about 5 inches off the top of the tank. I've got the 4MH, so the ends of the inside lights are just a bit over the braces. Can I cover them with something to reflect the heat, such as aluminum foil, or do I need to move my light up? That thing is HOT.
And I don't know if I can fit another Tunzi rock in the tank without another major renovation. I like the way they look. Maybe I can put it in the middle of the rocks on the other side and not at the bottom.....