I resolved the background issue.
My dissatisfaction with the paper background (standard LFS issued, black on one side and blue on the other) was that it was too glossy for my tastes. I've used a cloth background in the past affixed with velcro and was pleased with the result. But since I'm on a budget my first instinct was to try and use something I already had. It also had to be something light weight enough for me to attach easily since my tank was full and up against the wall.
I was mulling all this over while I was out working with the irises, and it occurred to me that I had some leftover landscaping fabric. It's certainly light weight and has a matte finish. I took the roll inside and draped it down the back of the tank. It was too "gauzy" and let too much light filter through--a definite concern for me since the tank sits partially in front of a window. I doubled it up, and got an acceptable result. With the curtain closed, and in the area of the tank on the wall, it provided a great looking matte black background.
I cut two pieces to size and ran some straight pins across the top to hold them together. Then I affixed it to the tank rim with four pieces of double sided tape across the top. I let the sides and bottom hang down on their own weight. Voila. Lightweight. Easily attached and easily taken off if I want something different. All done without having to move my tank or trying to contort myself into impossible positions trying to run tape across the bottom rim.
I don't think it would work well for a tank that gets a lot of excessive back lighting. With the curtain open to full sun, you can still make out a bit of the gauziness of the fabric. But with the curtain closed to the end of the tank, and at night, it presents solid black.
A trip to the barn, 30 minutes of fussing, and I had a new background. Best of all, I didn't even have to make a trip into town.
My five nephews are headed over for a BBQ this afternoon and they love to play in the creek. I'm going to put them to work helping me find the rocks I need to finish my scaping. Out for now to start the grill.