Decision essentials
Key points
Source control beats polishing.
Coarse-to-fine extends service life.
Actual flow is a maintenance signal.
Filter troubleshooting
Find what creates the load
Disturbed substrate, leaves, food, digging fish or a return aimed at the bottom need different fixes. Siphon accessible deposits.
If particles start after filter service, check assembly, torn bags and displaced old debris.
Filter troubleshooting
Build accessible capture
Use a washable first stage for coarse load and a reachable fine stage for temporary polishing. Do not pack media until water is blocked.
Rinse as instructed and avoid unnecessary disturbance of biological media.
From evidence to action
Decision matrix
| Situation | What to do | Why |
|---|---|---|
| Large debris | Prefilter or coarse sponge | Protect later stages |
| Temporary fine dust | Accessible fine layer | Controlled polishing |
| Flow falls rapidly | Remove source and service | Protect filter oxygen |
Check the result
Record the symptom and time before intervening. Repeat the same check afterwards, watch breathing and behaviour, and keep a timeline; if the problem worsens, prioritise safety and reassess the diagnosis. For “Suspended particles: capture them without choking the filter”, use actual flow is a maintenance signal as the final article-specific check.
Evidence
Sources and scope
Sources include institutions, technical studies and manufacturers. Chezur separates established mechanisms from editorial decisions for home aquariums.