Keeping Goldfish - The Right Way - Coldwater Articles.
Lastly, be aware that filtration also plays a large part in how many fish your aquarium will support. Your filter should run four times the total volume of water in the tank through the filter each hour. That means a 10-gallon tank requires at a minimum a filter rated at 40 gallons per hour. If in doubt, go higher, as there is no danger of over-filtering your water.
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Welcome, Guest.Please login or register. April 08, 2020, 10:54:11 PM Pet Goldfish - Aquarium Forum Community Aquarium Health and Illness Goldfish issues.
Comet goldfish grow to be around a foot long. 120 liters is about 30 gallons so I say about 2. Get fancy goldfish because you could do even five in a tank that size because they don't get as big.
For a pair of fancy goldfish you'd need at least 30 gallons (that's about 140 litres), a tank that volume would be about 3 feet long. Fancy goldfish get to about 8 inches long so anything smaller really isn't any good because they wouldn't have enough space to swim.
Option 4 - Snails, except large snails (Apple and Mystery snails), and those with high reproduction rate (e.g. Malaysian Trampet snails) - that being said, Zebra nerites and Ramshorns fit this size well, but I won't get more than 1 for 21 litre tank. You can add a snail with any options given above.