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With 2 ropefish and red tail, your bottom would be filled. So maybe some top and mid dwellers.
1 Gold, 1 Opaline Gourami, 6 congo tetras or
1 Angel 15 Cardinal Tetras or
6 Rainbows and 8 snakeskin Barbs.
I'd say ditch the Red-tail (better in a 75+gal) and go with a Rainbow Shark (look similar). Red tails get territorially aggressive as they mature and you can have one that claims the entire tank (like mine) as it's territory.
For either a Red tail or Rainbow, you'll need to establish territories with DW, caves and plants.