I think you will be fine as with the 400 watts you could put your bulbs 12 to 14" abaove your water line and this alone would help keep the heat down.
I raised my 250HQI's up an aditional 3 inches when I put the tank back tgeather and I now have no cooling fans running and I am only getting a 0.5 degree temp change where I was getting 2.0 degrees befor with two fans running.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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