In fact, the goldfish aquarium should contain a minimum volume of 20 gallons per adult fish.
As far as substrate and lighting are concerned, it is preferable to opt for large gravel or gravel. If you choose to make a planted aquarium, place some aquatic soil at the bottom of the goldfish aquarium to accommodate your natural plants.
For lighting, it’s just as simple… There is no need to add neon lights or other lights, just respect the day/night cycle that is essential for the well-being of aquatic animals.
How many fancy goldfish in a 10 gallon tank
It is possible to have 1 goldfish in a 10 gallon tank, however, we do not recommend it, as they will not reach their adult size with such a small capacity.
How many fancy goldfish in a 20 gallon tank
20 gallons is the minimum for a goldfish to reach its adult size and be happy. However, do not exceed this limit!
How many fancy goldfish in a 30 gallon tank
In a 30 gallon tank, we always recommend one fish, or maybe 2 small fish, according to our calculations, it would take 20 gallons per goldfish for them to live happily and develop in the right way!
How many fancy goldfish in a 40 gallon tank
That’s the minimum volume to accommodate 2 healthy goldfish, as well as to provide them with an environment conducive to their development!
How many fancy goldfish in a 50 or 55 gallon tanks
At this level, not much change, you can consider having a third goldfish, but the best would be to opt for a 60 to 65 gallon tanks!
How many fancy goldfish in a 60 or 65 gallon tanks
Here we go, you can now have 3 happy goldfish that can grow to their full adult size!
How many fancy goldfish in a 70 or 75 gallon tanks
Just as for a 50 gallon tank, it is still a bit too small to add a fourth fish, we recommend you have three, and why not add another fish of a smaller variety.
How many fancy goldfish in an 80 gallon tank
80 gallons is the perfect size for 4 goldfish. Remember that a goldfish needs 20 gallons to grow comfortably to adult size, so there is no problem with having 4 in the same tank, but be careful not to exceed this limit!
How many fancy goldfish in a 90 gallon tank
It’s still too small to think about adding a 5th goldfish, but we can only advise you to have 4, and to add another fish of a species that needs less space to live, like Guppies.
How many fancy goldfish in a 100 gallon tank
Now that’s a nice aquarium! With 100 gallons, you can have up to 5 goldfish, you will be sure that they will grow in a good environment until they reach their adult size!