CHEZURAquarium decisions A strong or new odour deserves prompt investigation. It cannot identify or quantify the hazard and never replaces tests and livestock observation.
If breathing is rapid, raise aeration and address water quality. Inspect for dead fish or snails, food, decaying plants and filter flow.
Do not lean into enclosed sumps or containers to identify gases; ventilate the room.
Siphon reachable waste and make a suitable water change. Service a loaded mechanical stage while keeping biological media wet.
If smell returns, log feeding, settling areas and equipment stops to expose the pattern.
| Situation | What to do | Why |
|---|---|---|
| Filter stopped | Aerate, test and restart safely | Possible oxygen loss |
| Localised remains | Remove and change water | Export the source |
| Odour from deep bed | Do not stir wholesale | Avoid abrupt release |
After aerate, test and restart safely, measure or observe Filter stopped again with the same method. Record Do not disturb deep zones blindly. as well; if neither changes as expected, revisit the diagnosis before adding another intervention.
Sources include institutions, technical studies and manufacturers. Chezur separates established mechanisms from editorial decisions for home aquariums.