01-10-2008, 02:42 PM
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1 more thought I'd like to add... While a chiller can resolve the issue of water temp from the heat of the lighting, the chiller won't fix the issue of melting plastic. I am thinking about the cover on the tank.
We have MH lighting on our 120, and in spite of the many fans Rob has installed, the tank cover is so hot that you can't touch it until the lights have been off for at least 10 minutes. He is also running a chiller, which keeps the water temp managable, but I have noticed that the plastic seam on the glass tank cover has shown signs of overheating.
This can be a huge fire hazard, and why we are working to fix this problem once we finish moving the tank to our new home. Hanging the lighting is one of the options we have considered. Another option is to move away from the MH lighting that is in there now.
Have you decided what is giong into your tank? Remember, there is no standard wattage until you know what animals will need what specifics. A tank full of mushrooms and zoas will require different than a tank with anemones, SPF's, etc. The other thing to take note of is decorating. Is it possible to build your rock structures high enough to get some of these types of animals closer to the surface? Sometimes it is possible to use placement of light sensitive animals to accomplish your goal without having to deal with some of the other "dangers" in such potent lighting. And, have you done any checking into the T5 lighting? I have run that on a number of large reef tanks and it works very well without the heat issues.