Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I have one tank I use a sheet of acrylic (or similar material) as a cover. It warps. This is just a 10 gallon tank, and a very thin sheet of acrylic.
Yup! Looks pretty bad.
On the other hand, if I drip any water on it, it runs right back into the tank!
It does not help to turn the sheet over, either. It just warps again the other way.
I have used much thicker pieces of acrylic for a slightly different use, over an aquarium, and the thicker material does not warp. It may be as much as 1/4" thick.
I have used some over a much smaller tank, and the small sheet was OK. This was just a 1 gallon tank, the cover was maybe 4" x 8", maybe smaller.