Fish wise?
Probably just the neons.
Substrate: Fluval Stratum.
Botanical items: lotus pods, indian leaves, acorns, maybe oak leaves?
Driftwood, and Java Fern and Java Moss, Water Sprite.
Is it exactly like the Rio Negro?
No, but as long as the fish are safe and content, that's all that matters.
I'll run a HOB and of course a heater!
Any suggestions, I welcome them.