Where can I get a black background? Or anything makeshift? It has to be as thin as paper to fit. I'm not interested in those "ocean background" but I can play around. Thank you! (It cannot be anything like cardboard in case it gets wet).
I live considerably far from them. I'm not allowed to do it at my school either. Is it possible to buy it at a pet store? I've never seen one though, so I'm slightly doubtful.
I went to Michaels and got a big peice of poster paper. One that had a shine to it, and it cost like $1.50 and just cut it to size. Plus I had extra for my other tank.