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Souvik Nag
As a thumb rule, tank length should be six time larger than goldfish' size.
20-Gallon per fish
Each oranda needs a minimum of 20-g. For two 30-g is enough.
30-40 Gallon for two fish
It grows between 6" to 10". However, bigger tank is always better.
10 Gallon for one fish
Additional 5-gallon is required if extra ranchus are added in same tank.
10 Gallon for one fish
Additional 10-gallon is required if extra black moors are added in same tank.
20 Gallon for one fish
They are not powerful swimmers. So they don't need a lot of space to thrive.
20 Gallon for one fish
Tank should contain with fine gravel bottom and hardy, cold water plants
30 Gallon or more for one fish
They grow up to 12-18 inches long. So it is recommended to start with a big tank.
75-gallon for one fish
They grow up to 12 inches long. So big tank is recommended to start with.
50-75 gallon for one fish
Goldfish produce an excess amount of bioload. Small sized tank can't handle it.
Goldfish grow anywhere between 6 inches to 2 feet. So big tank is must.
Due to the small tank goldfish may get atrophied muscles, spinal deformities & stunted growth