A technical guide to controlled light management in low-tech aquariums, covering spectral balance, PPFD targets, and style-based RGBW presets for Blackwater, Epiphyte, Natural, and Riverbank setups.

This article explains the core concept of biotope aquariums and summarizes four popular South American river systems (Rio Negro, Rio Tapajós, Rio Xingu, and Rio Tocantins) with their water parameters, native plants, and well-known fish species. At the end, you’ll be directed to a measured ALPHA RGBW preset guide to recreate these habitats with accurate lighting.