DIY Aquarium lids (not light hoods)

Plastic light grid with a duct tape hinge.

Clear corrugated plastic. Typically used for green houses. Check landscape places, hydroponics shops, green house suppliers.
A sign shop will stock yellow and white, and may be able to order clear for you.

For glass, go sliding. Many of the big box and some hardware stores sell a plastic trim piece shaped like the letter F. You cut it to fit inside the rim on the lip that most tanks have. The top of the F side down on the lib.
A dab of silicone or super glue or Gorilla Glue will hold it in place. The bottom piece of glass, or plastic, goes in the bottom channel. The top glass or plastic slides nicely on the middle of the F.

The best solution is used glass tops that you'd pick up at a fish club auction or fish club garage sale.

I have purchased allot of CL tanks without lids and usually would wait for a Petco $1 per gallon tank sale to get my glass lids for my 100+ Gal tanks. In fact my most recent tank a 220 gal 25X24X84 needs new glass lids which I will cut out of a new 20 Gal tall tank and then Gorilla-glue two 1/2"x1/2" PVC angle plastic tracks ($8) sections onto the center brace at the correct distance so that the new shorter glass lid panels can glide back and forth overlapping one another (two per-side) without falling into the tank. Overlapped glass lids do not require a hinge and prevents braking from dropping a lifted lid, my lids overlap and simply glide over one-another to open and require no lifting. Simple 24 inch plastic florescent tube fixture lighting can be had at WM for $15 and can be permanently mounted from a simple DIY plywood canopy, something I will also be making soon but in the mean tine my plastic lighting furniture simple rest atop my closed overlapping glass lids.

Do you have any broken or leaking tanks? You could probably cut up some pieces and use that as lids.

Chrisinator said:

Do you have any broken or leaking tanks? You could probably cut up some pieces and use that as lids.

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If you don't have any, you could probably get some very cheap or free either posting on CL or the fish club website.