I don't think I was amiss in putting two more snails in the tenner; I haven't seen the tomato nerite in there move in several days and I think that one might be getting old (they only live a year or two). I have been looking back on older images and posts, realized how truly awful my 20L was for a very long time, and then it was so lovely, and so striking with the black background (too striking, I prefer a more muted backdrop now), and such nice healthy greens just before the move. It was better with less light. Almost makes me want to go back to using T8 bulbs, instead of these fancy LEDs. I decided to cut the light coming into my tenner, because I remembered how nice and clean my anubias used to be. And the skull never had black smudges of algae all over it before, and the glass didn't used to get so gritty with BSA.
Less light. I took the extra plastic panel off the sliding top and used it to block some light from side end, instead.