Quick answer
Clean glass, siphon debris and service mechanical media, but keep established biological media wet and avoid cleaning every surface on the same day.
What to check first
- Identify where the main biological media is
- Use conditioned water for rinsing
- Check flow before and after
- Test ammonia after major maintenance
Write down the test results, recent maintenance, new livestock, feeding changes and equipment faults. A short timeline prevents repeated guesses and makes patterns easier to see.
A practical action plan
- 1. Change part of the waterRecord what changes and retest before making another major adjustment.
- 2. Rinse sponges gentlyRecord what changes and retest before making another major adjustment.
- 3. Clean one filter at a timeRecord what changes and retest before making another major adjustment.
- 4. Leave healthy substrate and décor biofilm largely intactRecord what changes and retest before making another major adjustment.
What to avoid
Do not sterilise the aquarium, boil media or use soap.
When it is urgent
Ammonia after maintenance means the biofilter was disrupted and needs immediate support.
How to prevent it next time
Use stable routines: quarantine additions, test before and after major changes, maintain backup aeration, keep equipment accessible, and record enough detail to compare today with the aquarium’s normal baseline. Prevention is usually cheaper and safer than emergency correction.
Research and review
This is original AquaNexus writing prepared for practical aquarium use. The husbandry framework was checked against authoritative veterinary, safety, scientific or specialist references.
Test rather than guess and make changes at a pace the livestock can tolerate. This guide does not replace aquatic veterinary advice. Follow product labels and local electrical-safety requirements.