The filter is the kidney of the aquarium: it moves water and houses bacteria that convert ammonia. Size the flow rate to the volume and do not wash the biological material with tap water.
Measure, don't guess.If there are fish and NH₃/NO₂⁻ammonia · conditioner · do not overfeed.
Equipment criteria for fish / aquarium
The “aquarium filter” accessory or habitat must be safe, sized and easy to clean. Prioritize well-being over showcase aesthetics.
- Security:No toxic parts, sharp edges or easy escape.
- Size:sufficient for natural behavior of the species.
- Maintenance:If you can't clean it often, it is not the right equipment.
Frequent errors
- Buying “to grow” without covering current needs.
- Mix recommendations from another species.
- Ignore signs of stress after a team change.
When to ask for help
Injuries, escape, drowning, poisoning by materials or total rejection of the new habitat: prioritize safety and professional consultation.
Based on reference sources.Orientation by species, anchored to reference sources. It does not replace veterinary care.
Filter and bacterial colony
- The filter houses nitrifying bacteria: do not wash it with hot tap water.
- Sizes flow to the volume and load of fish; A poorly cycled “powerful” filter does not save overcrowding.
- If ammonia/nitrite rises after cleaning: you have destroyed colony — act with partial changes and patience.
Frequently asked questions
Can I copy a tip from another species?
No. Do not blindly medicate or use mammalian advice for water.
Home medication
Do not use human drugs or viral tips.
Does this replace a veterinarian?
No.
Sources
- Merck — Aquarium fish www.merckvetmanual.com· consulted 2026-08-07
- OATA — Water quality (trade assoc.) ornamentalfish.org· consulted 2026-08-07
