08-01-2012, 10:56 AM
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None of the swords will "fill in" a background, and some get far too large for a 20g.
First suggestion is to make a background from plain black construction paper; you can buy a sheet at a hobby or craft-type store and cut it to fit, then scotch tape it on. I have this on all my smaller tanks. It "disappears" so the tank looks larger, and you don't see what's behind it. The fish will also be more relaxed, and fish and plants look better against black. The construction paper is not shiny so it doesn't reflect.
I always like to see through to the back in at least one spot, it creates a feeling of increased depth. Like a "black hole" in space.
Second, the Pennywort is good for background as it grows relatively straight. The dwarf sword would be a nice plant for the mid-ground, I would get 1 or 3.