Most fish tanks require a full cleaning about once a month, depending on stocking levels. Be sure to test water frequently to monitor quality

To clean an arowana tank, follow these steps:

1. Wash your hands thoroughly and ensure there are no lotions, perfumes, or chemicals present.
2. Do not remove your fish from the tank, as this can cause stress or injury.
3. Use a soft sponge or scrubber to clean the inside walls of the aquarium. Use acrylic-safe tools for acrylic tanks to prevent scratches.
4. Remove décor and artificial plants with heavy algae buildup.
5. Scrub décor using an algae pad and hot water.
6. If needed, soak décor in a diluted 3% bleach solution for 15 minutes, then rinse thoroughly until no odor remains and allow to air-dry completely.
7. Inspect the filter and clean it according to manufacturer instructions if needed. It’s recommended to replace filter media monthly or rinse it in old tank water during water changes, depending on tank conditions.
8. Use a siphon vacuum to remove waste and old food from the substrate while draining water.
9. Ensure all décor is fully dry and free of bleach odor before returning it to the tank.
10. Add fresh, dechlorinated water to replace removed water, ensuring it matches the tank’s temperature. The new water must be detoxified with a water conditioner to remove toxic chemicals like chlorine, chloramines, and heavy metals
11. Use an aquarium-safe cleaner on the exterior of the tank. Household cleaners should be avoided, as they often have ammonia and other chemicals that are toxic to fish. 
12. Check the aquarium’s filter, water temperature, and equipment daily to ensure proper operation.