Finch conflict is usually about access, not temperament
Finches are social but not cuddly flock birds, and most chasing at food dishes is a competition problem rather than a personality clash. A resident finch who has owned one seed dish in a familiar flight experiences a newcomer at that dish as a rival arriving at a scarce, defensible resource. New arrivals, stressed from travel and quarantine, feed urgently and at odd hours, which increases encounters exactly where residents feel most possessive. Species mix matters too, as pushier finch species can dominate passive ones at a single dish even when total food is plentiful. Your leverage is therefore environmental: change the maths of guarding so that chasing costs more than it gains and every bird can eat unobserved.
Quarantine and a first meeting on neutral ground
Keep new finches in a separate cage in a different airspace for a period your avian veterinarian advises, watching appetite, droppings and breathing before any introduction, because a sick newcomer added to a flight endangers the whole flock. Let the groups hear and, late in quarantine, see each other without contact if your setup allows, so voices and appearance are familiar before release day. Introduce birds in a rearranged flight: move perches, swap dish positions and add a novel branch on the day, which dilutes the residents sense of ownership over particular spots. Release newcomers in the morning when you can observe for several hours, never last thing at night when a bullied bird could go unfed and unnoticed until morning.
Win the dish war with numbers and distance
Provide at least one more feeding point than the number of finches, and more if your species are assertive, spaced as far apart as the flight allows and at varied heights so a single guarding bird cannot watch them all. Use wide, shallow dishes or scatter a portion of seed on clean paper on the flight floor, which spreads birds out and removes the doorway effect of a small bowl. Place leafy branches or a hanging toy between neighbouring dishes as sight barriers, since a finch that cannot see a rival feeding nearby feels far less need to chase. Keep every dish filled with the same mix and top them up together, because one freshly filled favourite dish instantly becomes the prize worth defending.
Read the first week and protect the losers
Brief chases where the displaced bird simply moves to another dish and feeds calmly are normal flock negotiation and need no interference. Act when one finch is repeatedly intercepted at every dish, spends the day hiding low or behind cover, fluffs and sits with eyes closing, or shows a prominent breastbone and weight loss, all signs it is not getting enough to eat. Move a vulnerable bird back to a side cage within sight of the flock to recover condition, then retry introduction with more barriers and dishes, or house it separately long term if the pattern repeats. Check crops and body condition by observation at dusk, when a well-fed finch should look settled and rounded rather than frantic at the dishes.
When flock friction needs veterinary or housing answers
Chasing that escalates to toe biting, blood, feather pulling or birds colliding with bars in panic is beyond normal settling and calls for immediate separation of the aggressor or the target, whichever keeps the flight calmest. Ask an avian veterinarian to check any bird that loses condition, breathes with a tail bob or stops singing and calling, as illness in one bird often first appears as being pushed aside by flock mates. Some combinations, such as strongly territorial species housed with very passive ones in a small flight, simply never share dishes peacefully, and permanent separate housing is a welfare answer, not a failure of your management. Larger flights, duplicate water points and quiet surroundings all lower the background tension that turns feeding into a contest.
Settling a flock takes daily eyes in the first week, and KinsLe Care Teams lets you assign morning introductions, dish refills and evening condition checks to named helpers, each marked complete so no observation is missed.