I have the BC14 and put in a MJ900 and it puts out alot of flow and didn't raise the temp at all.
I have also done a few other things to my BC. I put in a third 24w bulb, trimmed the overflow from Chamber1 to Chamber 2 to allow the tank to hold more water in Chamber2 and 3. I took out all the media that came with it and put live rock rubble in the 2nd chamber. The heater I have is a 50w stealth and it fits in the 1st chamber. I also put filter floss on the drip tray in chamber 2. The retun out let I replaced with loc line that has two nozzles.
I have only had it cycling for a few days, but I love it so far.