So, I have one small goldfish (tiny) in a 20litre tank. I am going on holidays for 3 weeks later this year and I was wondering if I got someone to come in and feed him once every week would that be fine. I would also do i big water change the day I leave and the day I come back. If that doesn’t work what should I do.
Should be good, plants in the tank ( duckweed is very good) would provide some food. Be careful about someone else feeding , unless they have their own fish. Generally a new person is very likely to overfeed. Try leaving individual food packets so they can just dump one packet instead of using food from a large container.