The frequency of cleaning a betta tank should be adjusted based on the tank type, filtration system, and stocking density. Here are specific recommendations:
I. Small Tanks Without Filtration Systems (<30cm)
Thorough cleaning: Replace 1/3 of the water every 3–5 days, and perform a full deep clean once a month.
Tank wall maintenance: Wipe the viewing surfaces once a week to prevent algae buildup.
II. Medium to Large Tanks With Filtration Systems (≥40cm)
Partial water changes: Replace 1/4 of the water every 7–10 days, and clean the filter media 1–2 times a month.
Tank wall care: Fully wipe down all surfaces every 2–3 weeks. Increase the frequency if keeping fish at high density.
III. Adjustments for Special Conditions
High summer temperatures: Shorten the water change cycle to replacing 1/3 of the water every 3–4 days. Step up tank wall cleaning if algae grows rapidly.
Low winter temperatures: Extend water changes to replacing 1/4 of the water every 7–10 days to reduce disruption to the nitrification system.
IV. Key Operational Notes
Water quality management: Retain some old water during changes, and keep the temperature difference within ±2°C.
Tool selection: Use a magnetic cleaner or soft cloth to clean tank walls—avoid chemical detergents.
Ecological balance: Leave a small amount of algae to help stabilize water quality; avoid over-cleaning.