Will 250 watt metal halides placed approximately 4" away from the top of the tank melt the plastic brace? I know these lights get really hot and I have seen tanks that had the plastic brace melt
I would be nervous about it being set up like that. Also, is there no way to move it one way or the other? With the light directly over the brace you are going to loose a ton of light and have a huge shadow, huge waste of a 250 watt MH.
What is the length of the fixture and the length of the tank? How many braces does the tank have? How deep is the tank? I know 150's come in a few different sizes. I imagine with three MH's in the fixture you are probably putting this over a 6' long tank? I would think they should be laid out so that there is space between each bulb for the braces.
Depending on the depth of the tank that does seem like a good amount of light for the tank, I would think you should be able to grow just about anything. I do not have any reef tanks, I've wanted to for several years but have never had the cash to plop down for one. So lots of knowledge on them, just no first hand experience![]()
Ahh, now I see your problem. 72" fixture will have the middle bulb right over your support. How are you mounting the light over the tank? You said it will be 4" above the brace? Will you be using a canopy? Obviously you want the tank to look neat and clean, I imagine moving the fixture one way or the other will make it look pretty off.
This is the part where I'm not going to be as useful. Not sure what the best course of action would be from here. Unless you only use the two outside bulbs plus the T5's? Or maybe 4" will be enough height and it wont melt? I know that they get pretty hot however so I have my worries. You may want to ask over at Reef Central if you haven't already. MFK is great for the large fish and tanks but there dont seem to be many people with experience using MH's.