Feeding behaviour tells you the pair's hierarchy first
Feeding time reveals the relationship faster than any other moment of the day, so log it in detail. Note which fish rises to the surface first, which one eats in the open and which one snatches food from behind the plants, and whether either fish drives the other away from the fall of food. Record what they were offered, how much was actually eaten, and whether the bolder fish's appetite is crowding the shier one's share. A pair that settles into a steady, shared feeding pattern over the month is showing you compatibility; a log where one fish eats less each week is an early warning you would never catch from memory alone, because each single day looks unremarkable.
Bonding signs worth writing down when you see them
Angelfish pairs announce themselves through small repeated behaviours, and the first month is when you learn which ones your pair uses. Log lip-locking — the brief mouth-to-mouth tussles that are part sparring, part courtship — noting how often they happen and whether they end calmly. Write down surface-cleaning behaviour: two fish pecking intently at the same leaf, slate or filter pipe are rehearsing a spawning site, and the spot they choose is worth recording exactly. Note twitching, parallel swimming and the pair defending one end of the tank together against other fish. Taken one by one these moments look like trivia; written down in sequence, they are the evidence that a pair bond is forming rather than a truce.
Chases, territories and the line between normal and not
Some chasing is ordinary angelfish negotiation, and your baseline should capture its normal shape so you can recognise the abnormal kind later. Log where each fish rests and which areas each claims, how chases start, how far they run and how they end — a short dash that settles is different from relentless pursuit that leaves one fish hiding all day. Record fin condition and any nips or marks on the same day you notice them, alongside what changed in the tank: new decor, a moved plant, a water change, a new tankmate. Without that context column, a torn fin is a mystery; with it, you can often see the rearranged territory that caused the argument.
Water and routine entries that anchor the behaviour notes
Behaviour floats on water quality, so pair every day's observations with the basics: temperature, and test results for ammonia, nitrite, nitrate and pH taken on your regular testing days, plus the size of any water change. Note the light schedule and anything unusual in the household — a noisy gathering near the tank, a missed feed while you were out. At the month's end, read the whole log back in one sitting; the pair's normal range for appetite, chasing and togetherness should now be written down rather than felt. KinsLe's Pet Passport keeps the pair's records together in one portable packet, so this first-month baseline sits alongside their later spawning notes, health history and tank moves whenever you need the full story.