Almost every call about a sick fish stalls at the same question, so answer it before it is asked: what is the water doing today? A specialist cannot judge an angelfish from its appearance alone, because the fish lives in its water and the water explains much of what the body shows. Running the tests takes minutes and turns a worried description into a case someone can triage in one call. Do the tests first, write the results down, and only then sit and watch the fish with a notebook. That is the order the person on the phone will work in too.
Water Numbers, Taken Today
Use your test kit on water drawn now, not last week's results and not a strip read from memory, and record the temperature reading and the pH alongside the figures for ammonia, for nitrite and for nitrate. Write down the tank's size and when the last water change happened as well; a reading means more with its context attached. If a figure surprises you, retest that one before calling rather than averaging the two — reporting both results honestly is more useful than a tidied number. Keep the kit's expiry and the time of testing in the note if you can. Specialists ask for these figures because a single high reading can redirect the whole conversation, and 'about normal' cannot.
Behaviour and Appetite, in Plain Words
Now describe the fish itself, in the order a vet would ask. When did you first notice something, and what exactly was it — a fish that stopped coming to the surface at feeding, one holding itself at an angle, fins kept folded tight against the body instead of spread? Note how feeding goes now compared with a week ago: arriving late, mouthing food and letting it fall, or ignoring it entirely. Watch the gills for a full minute and describe their pace and whether both sides move evenly. Record where the fish spends its time — top, middle, hiding behind planting — and how it holds its place in the tank's social order, since an angelfish dropping to the bottom of the hierarchy is information too. Plain description beats naming: 'small white dots along the tail edge, like grains' tells a specialist more than a disease name guessed from the internet.
Tank Mates and Recent Changes
List every other fish in the tank and whether each looks and behaves as usual, because a tank-wide picture points the call in a different direction from a single fish in trouble. Then work backwards through the last few weeks: new fish or plants added, a filter cleaned or replaced, a heater swapped, a missed water change, a different food, a treatment added to the tank for another fish. Recent change is the context specialists reach for after water numbers, and owners often remember the key detail — the new arrival three weeks ago — only when asked directly. Write it all down before the call so nothing depends on memory under stress.
Photographs That Help Rather Than Stress
Photograph the fish where it swims, in the tank's ordinary lighting, because that light keeps colours honest. A whole-body side view comes first, fins visible, then closer views of anything that looks wrong: a patch, a spot cluster, a frayed fin edge, an eye that has lost its clarity. Turn the flash off; repeated flash bursts and tapping on glass to pose the fish add stress it does not need. A short video, twenty seconds or so, earns its place for anything that moves — gill pace, swimming angle, the way the fins open and close. Compare your new pictures with an older photograph of the same fish if you have one; the contrast between then and now often shows a colour fade or weight loss that a single image hides.
Filed in KinsLe, the Pet Passport turns those photographs and readings into a portable record the specialist can be sent before you even finish describing the fish.