DIY backgrounds are not that hard, and in my opinion really pay off to make the tank more natural looking.
I like the foam and concrete method. It will take a week, and up to a week of soaking, but is worth it.
1. Either use Great Stuff, or silicone on foam to the back. Using foam that you silicone is probably easier, because you need to trim the Great Stuff, plus it is easier to use very thin pieces, so you don't lose much depth.
2. Paint on "concrete floor patch." It can dry to a "feather edge," and is polymer modified so it holds up to water better.
3. Repeat #2 one or 2 more times. Add black and/or brown acrylic paint to the last coat to make it dark gray. Wait several days before applying the last coat so it can fill in any cracks.
3. Paint it: Spray with water, wash on diluted black acrylic paint, wipe off with a towel. Let dry.
4. Lightly sand the edges with 220 grit or finer sand paper to add highlights.
5. Neutralize it by filling the tank, adding some vinigar, letting it soak for a few days.
Just my 2 cents.
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