New pond filters usually take 4 to 6 weeks to become fully biologically functional because it takes the beneficial bacteria that long to completely colonize the filter media.

New pond filters usually take 4 to 6 weeks to become fully biologically functional because it takes the beneficial bacteria that long to completely colonize the filter media.

Feed your koi and goldfish a well-balanced diet. Choose a high-quality food, or better yet, mix food from different brands to give them more variety and ensure their nutritional needs are met.