MtuPup, I'd just go to the LFS and buy a glass top. Unless you want to do something that you cannot do with the standard glass tops, I don't think it's worth the effort to fabricate one yourself.
If you haven't see a glass top yet, it has a plastic part that slips on to the pieces of glass that cover the rear half of the tank to make them longer. Like Sinfl said the plastic pieces are there to let you cut out the plastic to create a snug fit for your tubes/wires etc...
For your ventilation you can either cut out the plastic at the back and put fans there or another solution would be to lean the fan on the top of the glass in the gap where the top piece finishes. Since the two pieces of glass sit on rails one above the other one piece slides over the other. That creates a small gap between the piece on top and the piece below. Lean one edge of the fan on the top piece then lean the other edge of the fan on the bottom piece of glass so that the fan is slanted towards the gap. It'll blow air between the pieces of glass without having to make any modifications on the glass top.
The only reason I would fab a glass top myself would be to make a 3 rail system instead of two. Third rail would be screen not glass and sit on the middle rail between the top and bottom glass pieces. Then the top piece of glass could be slid back to ventilate the tank with the middle piece (screen) still closing off the tank to prevent any escapes.
Last edited by Green Ghost : 09-22-2008 at 07:14 PM.
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