Build the shade the fish evolved in
Wild neon tetras live under a rainforest canopy in slow, tea-dark water, and everything about planting their aquarium follows from that. Bright, white, high-tech lighting may show off plants, but it washes out the neons' colour and keeps the school pressed nervously against the back glass. A neon tank should feel like a shaded stream bank: subdued light, planting bunched at the back and sides, and a darker substrate so the fish read the floor as safe. Get the shade right and the famous red-and-blue stripe glows against the green in a way no bright tank ever matches.
The plants that thrive in neon water
Amazon swords suit the setup beautifully — big rosettes of leaves in the back corners give the school a backdrop to drift against, and they grow steadily in soft water under modest light. Cryptocoryne species fill the midground with bronze and green ruffles and ask for almost nothing once settled. Java fern and the smaller Anubias petite, tied to driftwood, add texture in the dimmest corners where little else will grow. None of these need injected carbon dioxide or intense light, which keeps the whole tank on the calm, low-maintenance footing neons prefer.
Floating plants do the real lighting work
The most important planting in a neon tank is at the surface. A loose cover of Amazon frogbit or salvinia breaks the light into shifting patches, and the tetras respond immediately — schooling looser, feeding more boldly, holding their colour through the day. The floaters' hanging roots also give the upper water a sense of structure that shy fish appreciate. Keep the cover partial rather than total: neons still need some lit water for feeding, and the swords and crypts below need enough light to keep growing, so thin the floaters whenever they close over completely.
Layout: a stage for the school
Neons are a mid-water schooling fish, and the aquascape should be built as their stage. Plant the back wall and both ends, then leave the front-centre open as a swimming lane with an unobstructed view of the whole school. A piece of driftwood arcing over that open space, with fern tied along it, completes the stream-bank feel and gives the fish a landmark to circle. Add the plants and let them establish before the tetras arrive if you can, because a finished, settled scape lets a new school settle in hours instead of days. A piece of driftwood leaking gentle tannins completes the blackwater effect the plants have set up — swords and crypts tolerate the soft, slightly stained water happily, and the school's colour deepens against it week by week.
A planted neon tank asks little day to day — a light on a timer, floaters thinned, the odd leaf removed — and if someone else ever runs it for a week, KinsLe's Care Pass gives that sitter temporary, clear access to the whole routine, from the lighting hours to which plants to thin, so the school never notices you were gone.