A black skirt tetra eats almost everything small that drifts past it, because it is a true omnivore from slow South American waters where the menu is insects, larvae, tiny crustaceans, worms, and soft plant material in whatever order the day provides. In an aquarium that translates into a varied, small-particle diet: no single food covers this fish, but a simple rotation of a dry staple, thawed meaty foods, and something green keeps a school of black skirts deep-bodied, dark-finned, and active for years.
The everyday base
A quality tropical flake or a small, slow-sinking micro pellet is the foundation most black skirt tetras live on, and it should be sized honestly for their mouths. These are not large tetras, despite the dramatic flowing anal fin that gives the skirt its name, and whole coarse pellets get mouthed and abandoned. Break flake into modest pieces, and the school will feed through the upper and middle water in unhurried, confident snaps.
Feed that base twice a day in amounts the group clears in roughly two minutes. Black skirts are calmer feeders than many tetras, so food that sinks past them tends to stay sunk; little and often suits them far better than a single heavy drop.
The meaty rotation they are built for
Protein variety is where a black skirt's condition is made. Thawed daphnia is an ideal regular offering, close in size and nutrition to the tiny crustaceans they pick off in the wild. Baby brine shrimp and adult brine shrimp, mosquito larvae, and finely divided bloodworm all rotate in well, each triggering the short, purposeful darts that tell you the fish recognise real prey. Offer these foods two or three times a week in place of the dry feed rather than on top of it, so total intake stays level while quality rises.
Live foods of the same kinds are relished, but they are an enrichment, not a requirement; a keeper who never feeds live will still raise excellent black skirts on the thawed rotation alone.
The green part of the plate
Black skirt tetras browse. They will take vegetable-based flake, pick at soft algae films, and mouth fine-leaved plants, and this grazing is a normal part of their diet rather than a sign the meaty foods are lacking. Including a green flake in the rotation supports digestion and keeps that browsing aimed at food instead of at your softest planting. A school that suddenly starts shredding plants in earnest is usually underfed on the vegetable side, or simply underfed overall, and the ration deserves a look before the fish get the blame.
Feeding the whole school, including the shy ones
Black skirts are peaceful but hierarchical in a quiet way, and long-finned individuals can be slow to push into a food patch. Spread each feed across the school's whole stretch of water and pause to confirm the palest, smallest fish are eating with the same rhythm as the bold black-finned leaders. A skirt that hangs back day after day and thins while its schoolmates deepen in body should be target-fed and watched; if it keeps refusing food or shows frayed fins and laboured breathing, an aquatic veterinarian is the appropriate next step, because diet is no longer the likely cause.
Keeping a simple menu consistent
This is an easy fish to feed and therefore an easy fish for a whole household to feed, repeatedly, on the same day. Agreeing the rotation and recording the feeds keeps the variety real instead of theoretical. KinsLe's Care Teams lets you assign each black skirt feed to a named helper and mark it complete with a timestamp, so the school gets its planned mix of staple, protein, and greens rather than whichever tub the last person opened.