Decision essentials
Key points
Water travels down from higher fittings.
Do not tighten cracked plastic.
Condensation is a conclusion after leak checks.
Filter troubleshooting
Immediate safety
Do not stand in water to reach a plug; isolate at a safe breaker if needed. Close taps and move only a manageable vessel.
Mark tank level and maintain oxygen while filtration is offline.
Filter troubleshooting
Dry staged diagnosis
Dry, apply tissue and fill in steps. Inspect head seal, valve block, hose ends, cracks and overflow.
Structural damage requires replacement, not improvised pressure sealant.
From evidence to action
Decision matrix
| Situation | What to do | Why |
|---|---|---|
| Water near outlet | Isolate at safe breaker | Avoids electrical contact |
| Drop at seal | Open and inspect | Tightening may pinch |
| Cracked vessel | Retire equipment | Structural failure |
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 “Filter leak or dampness: stop, contain and trace from the top”, use condensation is a conclusion after leak checks 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.