This is a myth.
Fish will continue to grow to whatever their adult size is or die trying. This myth was possibly started by hobbyists with goldfish which are commonly kept in bowls for years.
What most people don’t realize is goldfish can live up to 30 years. Living in small poorly filtered tanks or bowls will cause stunting, usually from prolonged ammonia exposure. If the stunting doesn’t kill them the waste build up will. At some point the ammonia or nitrates will reach lethal levels quicker than you can clean the water.
Here are some common fish that get big and a recommended tank size for them.
Fish will continue to grow to whatever their adult size is or die trying. This myth was possibly started by hobbyists with goldfish which are commonly kept in bowls for years.
What most people don’t realize is goldfish can live up to 30 years. Living in small poorly filtered tanks or bowls will cause stunting, usually from prolonged ammonia exposure. If the stunting doesn’t kill them the waste build up will. At some point the ammonia or nitrates will reach lethal levels quicker than you can clean the water.
Here are some common fish that get big and a recommended tank size for them.
Fish Name
|
Average Adult size
| Recommended tank size |
Red Tail Cat
|
5 ft.
|
1,000
Gallons
|
Iridescent
Shark
|
4 ft.
|
1,000
Gal.
|
Plecostomus,
Regular
|
3 ft.
|
120
Gal.
|
Gourami’s
(Not Dwarfs)
|
6+ inches
|
55Gal.
|
Cichlids,
south American
|
12 inches
|
55Gal.
|
Gold fish
|
16 inches
|
40
Gal. Each
|
Goldfish,
fancy (round)
|
3 inch diameter
(tennis ball)
|
20
Gal. Each
|
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