Tank Health &
Maintenance
Good maintenance isn't about doing more — it's about doing the right things, at the right time. Most tanks fail because they're maintained without understanding why.
What "Healthy" Actually Looks Like
A healthy tank isn't spotless. It usually has slight algae presence, stable (not perfect) parameters, predictable behaviour, consistent feeding response, and minimal sudden changes.
Key PointProblems start when we try to force a tank to look "new" instead of letting it function naturally.
Water Changes
Water changes dilute waste and replenish minerals — they don't reset the tank.
- Small, regular changes beat large, infrequent ones
- Consistency matters more than volume
- Match temperature and avoid drastic parameter swings
- 10–25% weekly for most community tanks
- Increase frequency before increasing volume
WarningLarge water changes can shock livestock if done suddenly.
Filter Maintenance — Less Is More
Your filter is a bacteria farm, not just a debris catcher.
- Never deep-clean all media at once
- Rinse media in tank water, not tap water
- Clean only when flow is reduced
- Stagger cleaning if using multiple filters
WarningOver-cleaning filters is one of the fastest ways to destabilise a tank.
Substrate Care Without Disruption
- Light vacuuming during water changes
- Focus on visible debris, not deep stirring
- Avoid aggressive cleaning in planted tanks
- Never strip the entire substrate at once
Algae — A Symptom, Not the Enemy
Algae doesn't appear randomly. Common causes include excess feeding, inconsistent lighting, overstocking, incomplete cycling, and over-cleaning followed by instability.
RuleFix the cause, not just the algae. Scrubbing without correction usually makes it return worse.
Reading Fish Behaviour
Fish often show stress before water tests do. Watch for reduced appetite, excessive hiding, clamped fins, gasping or hovering, and sudden aggression.
When to Intervene — and When to Pause
Intervene When
- Fish stop eating
- Water turns cloudy suddenly
- Deaths occur close together
- Equipment fails
Pause When
- Parameters are stable
- Behaviour is normal
- Algae is cosmetic only
- Changes are gradual
RememberOverreaction causes more damage than patience.
Quick Reference
- Consistency matters more than intensity
- Clean gently, not aggressively
- Filters house bacteria — protect them
- Algae is information, not failure
- Fish behaviour tells the real story
- Stable tanks come from calm routines
Important Context & Expectations
Tank health depends on stocking levels, feeding routines, maintenance consistency, filtration maturity, and environmental stability. Losses caused by poor maintenance practices or sudden changes are not product faults.
For full details refer to our Terms & Conditions and Claims, Replacement & Insurance pages.