I have 2 400w MH over my tank, a 225gal tall, 6 ft long. The tank has a canopy on it so we have raised the canopy a bit and the lights sit about 8 in above the water. Is it a problem to have the lights that close to the water. I have no other way so far of mounting them. Should I start looking? Plus I have them mounted lengthwise, I have heard I will get better use of them to mount them front to back, any feedback??