Lights mounted on Ceiling?

Okay I have a weird situation.....I am doing a little bit of a wall built in tank...What I have is an older home with slanted ceilings upstairs so the top of the tank will have about 1 foot clearance in the front and since the ceiling slants about 6 inches or so in the back....Then I will be building a false wall out to the front edge of the tank...I am wondering if I can mount my lights, on the slanted ceiling....the lights would be slanted and centered so around 10-8 inches from the top of the tank.....I have 2- 175w MH and 2- 30W Blue Actinic lights.....I think I would paint that section of ceiling with high temp paint...I used Green Sheetrock to help with the water evap..... Can I do this?  I also was planning to have a small fan blowing through to help keep it cool....there will be a front but no sides or back for the hood, so it should not trap the heat as much as a normal hood....I can post a picture if you need more visual...let me know what you think! 

I did a quick google sketch to show you what I mean....

I want it to look something like this when it is all DONE!

if you where to mount the light completely horizontal how high would they be off the tank? I'd try not to mount them on an angle if it was me

Like others have said use a hanging kit, and make the front cables longer then the back so that it's hanging even. If you are worried about too much light at 6 inches I wouldn't be. The only worry there would be heat - buy a cheap clip on fan to run across the surface of the water to cool it down.

Having the light at an angle is going to loose you a ton of light and might even stress the fixture unnecessarily.

with the angle you are purposing the light will be directed out through the front of the glass. Is there any space behind the sheet rock you can cut out to make it more square to give you the 9 inches you want?

Well If you don't think 5 or 6 inches is not to close to have the light then I will hang them level!!!  and I put up the sheet rock....not room I screwed it directly to the roof joist beams....

My light is a 6 bulb T5 fixture, and it is about 8" from the top of my tank. I think with 175w halides you should be good at 5 to 6 inches. It would be cool if you could mount the wires that hold the light to some kind of slide rail system on the ceiling. That way you can move the light all the way to the side towards the door if you need to get in the tank and do some maintainence

Preston I like the Idea of slide rail????????  got me thinking??????  that would be great!  I will have to see if I can engineer something.

What originally came to my mind was something like what we would see in a heavy duty drawer, like these. But i think there would be limitations to how far they would slide...