Sounds to me like the halide would be to close to the water. I have heard of some 4in. off the water, with good air movement. Mine are over a foot, with most being around 8in. or so.
I have read some horror stories of halides warping and eventually breaking acrylic braces. The the tank bows.
You would need a higher hood, IMO, but thats a guess with out seeing it.
I agree, use only powerheads with brackets.