Keep tank mates that can live in the same conditions as goldfish. Goldfish mainly prefer cooler temperatures from 50-70F and can live at room temperature without a heater. For many fish on our list, this environment is on the lower end of their comfortable temperature range.
Keeping a goldfish in a nano tank is a time and effort commitment that many people cannot commit to. There is a large amount of care required to maintain high water quality and your fishs health in the long run.
Best Tank Mates: Other goldfish of similar swimming ability and size. Invertebrates: Large snails are great; however, avoid small shrimp like Cherry Shrimp, as they will be eaten. Avoid: Tropical fish, Plecos, and aggressive barbs or cichlids.

Goldfish Tank Setup. Why Goldfish Should Not Be Kept in Bowls.In order to add new fish to your goldfish tank, they need to have a similar diet and temperature tolerance as your goldfish. Goldfish that are securely kept on their own need plenty of swimming space.
Xiaomi Mijia Smart Fish Tank 4 .
As we can see from the illustration, Smart Fish Keeping Goldfish Tank has many fascinating aspects to explore.
Understanding fish stocking guides. Giving fish tanks as gifts.Goldfish tank size calculations. Its not uncommon to see 100 litres, or thereabouts, quoted as the minimum for one goldfish, with varying amounts of additional litres for additional fish.