Why angelfish pairs eat a clutch they just laid
Egg eating in angelfish is common and usually not a verdict on the pair. Young pairs often need several spawns to learn the sequence of fanning and guarding, and a pair that feels exposed — tankmates circling, heavy foot traffic past the glass, bright light at night — may eat the eggs as a stress response. Some pairs, though, eat every clutch no matter how calm the tank is. If your pair has eaten three or more consecutive spawns in a settled tank, stop waiting for them to reform and raise the eggs yourself; the pair will keep spawning roughly every couple of weeks, so you will have plenty of chances.
Move the eggs, not the parents
Angelfish lay on a surface — a slate, a broad leaf, a cone — and that surface is your handle. A few hours after spawning, or as soon as you see the pair start picking at the eggs, slide the whole slate out and into a small bare hatching tank filled with water taken from the parents' tank, so temperature and chemistry match exactly. Set the slate at a slight angle with the eggs facing the flow from an airstone. The parents stay in their own tank, undisturbed, and usually spawn again on a fresh surface before long.
Replace the parents' fanning with moving water
In the pair's care, the eggs survive because the parents fan them constantly and mouth away anything dead. In the hatching tank, a gentle curtain of fine bubbles from an airstone does the fanning: position it so water moves steadily across the eggs without blasting them off the slate. Check the clutch a few times a day and remove any egg that turns opaque white with fine tweezers or a pipette — a dead egg grows fungus that spreads to its living neighbours within a day, and this picking-off is the job the parents would have done. Expect hatching in about two to three days at typical tropical temperatures; the hatchlings hang from the slate as wrigglers, living off their yolk sacs.
First feeds, timed to the free-swimming day
Do not feed while the fry are still wriggling — they cannot eat yet, and food only fouls the hatching tank. When the whole clutch lifts off and swims horizontally, usually around a week after the eggs were laid, feeding starts. Infusoria or a liquid fry food suits the first day or two; freshly hatched baby brine shrimp is the food angelfish fry truly thrive on, and their bellies turn visibly orange after a good meal. Feed small amounts three or four times daily, siphon the bottom after feeds, and change a little water each day with matched water as the fry grow into the tank.
Grow them on, and decide when to try the parents again
After a few weeks the fry begin to show the angelfish body shape and can move to a larger grow-out tank with a sponge filter and more room per fish. Meanwhile, you can test the parents occasionally: leave one clutch with them in a quiet tank and watch whether they fan rather than eat. Some pairs settle with age; some never do, and artificial raising remains your route with them. Because a hatch demands feeding and checking several times a day for weeks, sharing that rota through KinsLe Care Teams — each feed and water check ticked off with a timestamp — keeps the clutch on schedule even on days you are away from home.