Yes — blue gouramis reward a keeper who writes things down, because their behaviour shifts as they grow. A juvenile that drifted peacefully near the plants can, months later, become a mature male who guards that same corner, builds a bubble nest at the surface, and drives tankmates away from food. Without dated notes, that change looks sudden. With them, you can see exactly when the chasing started, what had just been added, and whether feeding had changed in the same week.
What stocking details matter for gouramis
Record the date each gourami arrived, its sex if you can tell it, and where it settled in the tank. Males develop a longer, more pointed dorsal fin and stronger colour, while females stay rounder, and logging that distinction early prevents a later surprise when two supposed companions turn out to be rival males. Note tankmates added or lost, plants or floating cover added, and any rearrangement of decor, because moving a favourite shelter can restart a territory dispute that had gone quiet.
Also note the tank's upper level specifically. Blue gouramis are labyrinth fish that breathe at the surface and feed there, so a log entry saying a fish stopped coming up is more meaningful for this species than for a mid-water fish. Record who reaches the surface first, who hangs back, and whether floating food is gone before a shy individual gets any.
Feeding notes worth keeping for this species
Write down what you offered, where you scattered it, and who actually ate. Because gouramis feed at the top, scattering food across a wide surface area rather than dropping it in one spot changes who gets fed, and your log should capture that difference. Note days when a fish mouths food and spits it out, days when the belly looks hollow after feeding, and days when one male monopolises the feeding corner.
Note appetite alongside behaviour, not apart from it. A gourami that eats eagerly but has started chasing others after meals is showing a territory pattern. A gourami that has stopped chasing and stopped eating is showing something quite different, and only a written sequence lets you tell those two stories apart weeks later.
Reading the log when something changes
When fins look torn, work backwards through the entries. Did the damage follow a new arrival, a removed plant, or a change in the male-to-female balance? Did it start after a missed few days of feeding notes, when one fish may quietly have been outcompeted? Gouramis rarely become aggressive without a trigger in the tank, and the log is how you find that trigger instead of guessing and rearranging everything at once.
Watch for a fish that stops visiting the surface, hides low for long stretches, loses colour, or shows rapid breathing away from the top. Those changes, especially alongside a falling appetite recorded over several days, are a reason to check water conditions promptly and seek advice from an aquatic veterinarian or experienced fish health professional if the fish does not recover once conditions are corrected.
Keeping the record useful, not heavy
Two short lines after the evening feed are enough: who ate, who chased, anything new. Once a week, add stocking changes and a note on the bubble-nesting or courtship behaviour if you see it. The value is not volume — it is being able to reconstruct a month of gourami politics from honest dated entries when you need to decide whether to add cover, separate a bully, or leave a settled group alone.
A tidy home for those entries is KinsLe's Pet Passport, where your blue gouramis' arrival dates, feeding patterns, and tankmate history can sit in one portable packet ready for a vet visit, a house move, or a handover to a fellow keeper.