confused RBTA

[fishoholic]

I have 14k-250 watt phoenix MH bulbs. The tank is 3 feet deep and the rock it is on is about 1/2 way to a little more then half way up the tank. I think it was under T5's in the store. However I have had the rbta for 4 weeks and I haven't touched it since we put it in.

Here is a pic. of it this morning with the lights out, weird how much more open it is.