hood and leveling?

[limitedslip]

The hood:
Currently, my hood is open faced (no front or rear). And my question arises on the install of the doors. When adding fans to reduce heat from metal halides, should I put pull fans on one side and push fans on the other, or should push fans on one side and a vent work on the other? I am confused, because I saw a few writeups where they had 2 push fans, which would kind of defeat the purpose because the warm air would circulate inside the small space, resulting in higher water temps....
the leveling:
Well, after 2 days of trying to level my aquarium (thanks to the help of no one, 125 tank is heavy to move yourself

), I accomplished it, but before I start throwing in the water again, I had a question. I used carpet reminents to level off the stand. I put a bunch of squares underneath the 2 corners of the tank that were off, and i jammed more carpet underneath the any gap there was that was creating by lifting one side of the tank up. Now the tank is 100% level, but, will this be ok when I have all the water in it, or will I run into lving problems or even another cracked tank because of it?

 

[saltn00b]

well you sorta lost me with your leveling rant, a picture should help. my tank is in a room that is not level at all, my water is on about 3-5 degree slope in the tank...
concerning the fans, have them all blowing IN and across the water surface and lights.
you are then pulling in cooler air, encouraging evaporation by air blowing over a churning surface which reduces temps dramatically. also, by keeping light bulb temps down, you increase the life of the bulb, and incrase the PAR value.

 

[scsinet]

I've found that two intake fans, pulling outside air into the canopy, works well for hoods that have an open back. They displace the warm air from inside the canopy with cool air from outside.
I prefer intake fans because it prevents the fans from getting exposed to the moist air from the tank.
I'd think that your carpet squares are going to be compressed by the weight of the tank. I'd use wood shims instead.

 

[integral9]

you might run into trouble when the carpet pieces compress after the weight is applied. You could fill the tank w/ tap water and wait a week or so.
I leveled two tanks that sit on a carpet w/ concrete subfloor by using left over hard wood flooring boards and some wood shims. I set the tanks on two planks of wood stacked on top of each other. (1 set of planks for each side of the tank). After that I leveled it by putting the shims in between the planks of wood. Then I added the sand, rocks, water, etc. After a couple of weeks the carpet fully compressed, but unevenly and I had to reshim, which wasn't that bad.

 

[limitedslip]

ya, I acutally talked to my LFS (they are acutally knowledgable) and they said wood shims, came back and checked this out, you all said wood shims, i bought wood shim, I used a whole busshel of to get my tank lvl, I havent added water yet, but it seems wobbly, probably because half of it is on a hard surface, and the rest is on carpet ><& but anyway, its all level now.
as for the lighting, I guess I'll put inward fans on both sides and not put a cover over the backside of the hood.
thx for your help.