You could always go to any arts & crafts store (Michael's, A.G. Moore, etc) and purchase a large sheet of black felt backing material or go to Super K Mart or Walart a buy some black denim, cotton/linen twin bed sheets or drapes (yeah, enough weird people out there! Even available in black).I want to put up a black background for my native tank. I didn't think about painting it like I usually do until like 2 days ago. Since then I got the paint for it but I didn't have enough room to get it, so I used that paint for my stand instead. Since I don't have the room to get the paint roller behind the tank I thought about using poster board, but I'm worried about it getting wet and becoming soggy( my pseed likes to splash me before I feed him sometimes) so anykind of paper is out of the question. I went to the lfs today and looked around for one of their backgrounds to fit my tank and they didn't have any, literally zero backrounds for anything larger than a 20 gallon. So That route is is a no go. The only other thing I could think of is getting black trash bags and using one to cover the back and tape it on. Unless anyone has some other way to accomplish the black backround that I haven't thought of. But if you have used the trash bag idea do you have any tips on how to do it without having wrinkles. Pictures are always a plus.
Cut to size and tack to entire back top frame with rubber cement then let cure for a day...then stretch slightly to remove wrinkles and tack just the bottom back corners. Tiny bit of masking tape to hold til adhesive cures.