Once or twice a day - and why not more
Leopard danios burn energy like the streamlined river fish they are, but their stomachs are small and their appetites are not a reliable gauge. One or two feeds a day is the right rhythm for healthy adults: a morning feed and, if you like, a smaller evening one. Healthy danios will beg at the glass every time you pass, all day, because snapping up food is what they do - it is opportunism, not hunger. Feeding on every pass turns that charm into cloudy water, because what a danio cannot eat in the moment sinks, rots and quietly degrades the tank for everything in it.
The two-minute portion
Size each feed by time, not by the pinch: offer only as much as the school clears completely in about two minutes. Leopard danios feed at the surface and in mid-water and they feed fast, so scatter micro pellets or finely crushed flake across a wide area rather than dropping it in one spot - a single pile lets the boldest three fish eat everything while the shy ones circle. If food is still drifting down untouched after two minutes, the last feed was too big; cut the next one. If the surface is bare in twenty seconds every time, nudge the portion up slightly.
Variety across the week
Frequency is only half the answer; the other half is rotation. A decent staple - micro pellet or quality flake - can carry most days, but two or three feeds a week should be something with more life in it: frozen daphnia, baby brine shrimp, or finely chopped bloodworm. Danios hunt these with obvious enthusiasm, and the variety rounds out their nutrition in a way a single dry food does not. Fry and young growing fish are the exception to the adult rhythm: they do better on smaller meals three times a day while they are putting on size.
Adjust for the tank around them
The right frequency bends with circumstances. In a community tank where slower fish need time at their food, feed the danios first at one end to occupy them, then feed the shy species at the other. In hot weather, when the tank runs warm and oxygen sits lower, lean toward the smaller end of portions; in a cool, roomy tank of only danios, two modest feeds suit their constant motion. And if you go away for a weekend, healthy adults genuinely come to no harm missing a day or two - a short fast is far safer for the water than an overfilled holiday block crumbling away in your absence.
The real enemy is the double feed
Ask danios' keepers what actually goes wrong with feeding and it is rarely the schedule on paper - it is two people each giving the 'morning' feed, plus a child treating the begging as an emergency. Danios are so theatrical about food that every member of a household can be separately convinced the fish are starving. Writing the feeds down ends the argument: with the danios' meals on a Care Teams list in KinsLe, each feed gets ticked off with a timestamp as it is given, so the second person to the tank sees the fish have eaten and the begging is exposed as the performance it is.