Caring for baby chili rasboras means caring for fish you can barely see. The adults are themselves tiny, a deep red thumbnail of a fish from peat swamps, and their fry are specks that spend their first weeks grazing micro-organisms from leaf litter and moss in dim, acidic water. The home strategy is therefore different from a bare nursery tank with scheduled foods. You build a small, mature, living habitat, a tank that feeds its own fry, and then you supplement it carefully. Keepers who try to raise chili fry like guppy fry, in clean empty plastic, lose them; keepers who raise them in a seasoned jungle of moss and leaves succeed almost by accident.
Build the nursery as a habitat, not a box
Start with a small tank that has been running for weeks before any spawning: soft, acidic water, a bed of leaf litter, generous moss and fine plants, and a mature sponge filter. That seasoning grows the infusoria and microfauna the fry will graze from their first free-swimming day, food no schedule of yours can deliver as continuously as the tank itself can. Stock it with the adult chilis or move egg-laden moss and leaves into it, and keep every other fish out. Even a small, peaceful species is a predator at chili fry scale, and the fry's only defence is being beneath notice in a tank full of texture and shadow.
Feed the tank's microfauna, then supplement
Your feeding has two layers. The first is feeding the habitat: a little powdered fry food or a crumbled leaf sustains the micro-organisms the fry eat, so the tank stays stocked with living food around the clock. The second is direct supplementing, infusoria or liquid fry food delivered gently near the moss several times a day in very small amounts. Baby brine shrimp comes later than keepers expect, only once fry are visibly growing and hunting in open water. Overfeeding is the nursery's great danger, because in a small, acidic, dim tank, excess food decays into conditions that kill specks of fish before you can see anything is wrong.
Keep water changes tiny and the tank dim
Chili rasbora fry live in water that changes slowly in nature, in swamp pools that are stable for months, so mimic that: top up evaporation, change very small amounts with matched soft water, and never perform a heroic clean. Keep light modest and planting thick, because bright bare conditions stress both adults and fry of this shade-loving species. Work at the tank slowly and check for fry with a torch beam along the moss, counting specks rather than chasing them. The less this nursery is disturbed, the better it works, which makes chili fry a good project for patient keepers and a poor one for enthusiastic rearrangers.
Watch for red: the first colour is your progress report
For weeks the fry are translucent motes, and your only evidence of success is that the motes persist and slowly enlarge. Then, in juveniles raised well, the deep chili red begins to bloom, males first and brightest, and a group of them threading through dark leaf litter is one of the finest sights in nano fishkeeping. Move youngsters to a larger group tank only when they are big enough not to be bullied or outcompeted, and keep them with their own kind, since adult chilis in a group of their own species colour and behave far better than a few lost among larger fish.
Make the almost-invisible jobs explicit
Because the work is tiny and the fry nearly invisible, chili care fails through forgetfulness more than through error: the supplement not given, the top-up skipped, the sponge filter left clogged. Writing the routine down as assigned jobs is the fix. Listing the moss check, the micro feedings, and the small top-ups in KinsLe's Care Teams means each helper knows exactly which small act the nursery needs that day, with completed tasks marked by a timestamp, so a brood at the very edge of visibility still receives full-sized attention.