http://www.craftdirect.co.nz/product_info.php?cPath=13_209&products_id=25764
http://www.heartofclay.com/page13.htm
http://www.elbastidor.com/CANVAS/PCPF.htm
We've used something like the following for bowl tops, though a slightly big fish can bounce them off.
http://www.hishealingways.com/sprouting/plasticcanvas.html
If you Google plastic canvas, you will get a zillion projects one can make. Just in case you get tired of fish and have lots of extra time. There are things there for kids to do in the summer when they complained of boredom. ;)
I still prefer glass or Plexiglas for tank tops - despite the tendency of the latter to warp a bit in humidity. Too many of my tank tops are pieces of former aquariums, where a side was broken or for the really old stuff, where the stainless steel frame actually began to crumble.
I know one guy who fashioned wooden framed screens for ten-gallon aquariums. Great air circulation. Lots of evaporation too.
Then there are Mike Stoecker's Plexiglas tops, where he scored the dimentions of the tank, folded and broke the Plexiglas along those scores. One could burn holes in that stuff to run airlines in. Another hole in the middle, about the size of the end of a turkey baster, could be made for feeding. I have used pliers to heat a 3" nail over the stove, when no one else is home. The hot nail is then pushed into the Plexiglas in the appropriate spot.
I really need to get a little camping stove so I can do things like that in the back yard. Boiling gravel and peat moss would be much less threatening to domestic relationships too.
Mike also took a little pipe cutter and sliced 2 cm pieces of extra aquarium filter tubing. (Doesn't everyone have a little pipe cutter for the fishroom?) Outdoors he would use a couple drops of solvent on one end of the tube segment to connect that piece of tubing to the side of the Plexiglas and voila! A handle!
So there are many home-generated approaches to covering tanks. Again, these are just a few.
All the best!
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