Tropical Fish Tank Fish
Tropical Fish Is it overcrowded and do fish grow to the size of your tank?
I’m relatively new to tropical fish keeping although my family have fish tanks. I keep freshwater fish – a lush mixture of colourful very small guppies and a male simese fighting fish, some tetras (neon) and much more, but all of the small, guppy and molly, tetras. I have perhaps all together 19-22 small fishes. The biggest is the darf Gourami, which is only 7cm long. I have several bottom fish feeders. 2 live plants, a small rock and one slate – all look very well. 3 way high filter with air pump and you name it i have it.
My tank is a hexogan 6 side tank, 5.7 US gallon. I work out the sq area to be just below 1500cm sq I believe.
I dont think of getting more fish – unless i removed some and taking them back to the shop where they’re happy to take fish.
My fish are incredibly healthy, happy and look very well!
the water is clean – and everything is happy and compatible.
But, i am worried of oversizing , can anyone tell me if a small tank is too small? Thank you 
Common Glass Aquarium Sizes
5.5 Gallon 16×8x10 (128 sq. in.)
10 Leader 20×10x12 (200 sq. in.)
10 Hexagon 14×12x18 (127 sq. in)
15 Gallon 24×12x12 (288 sq. in.)
20 High 24×12x16 (288 sq. in.)
20 Long 30×12x12 (360 sq. in.)
25 Gallon 24×12x20 (288 sq. in.)
29 Gallon 30×12x18 (360 sq. in.)
30 Gallon 36×12x16 (432 sq. in.)
30 Breeder 36×18x12 (648 sq. in.)
33 Long 48×13x12 (624 sq. in.)
37 Gallon 30×12x22 (360 sq. in.)
38 Gallon 36×12x20 (432 sq. in.)
40 Long 48×13x16 (624 sq. in.)
40 Breeder 36×18x16 (648 sq. in.)
45 Gallon 36×12x24 (360 sq. in.)
50 Gallon 36×18x18 (648 sq. in.)
55 Gallon 48×13x20 (624 sq. in.)
65 Gallon 36×18x24 (648 sq. in.)
Petite body fish
1” per gallon or 1” per 12 sq. in. of surface
For example 20 long has 360 sq. in. surface area
360/12=30
Can a 20 long support 30” of fish? Probably not.
A 20 high has only 288 sq. in. surface area
288/12=24
Can a 20 long support 20” of fish? Probably not.
A 25 is also 288 sq. in. surface area
288/12=24
Can a 25 support 24” of fish. Probably.
I like to average the two for a more accurate capacity.
For the 20 long, 30 by surface area, 20 by volume averages to 25”
Can a 20 long support 25” of fish? Probably.
For the 20 high, 24 by surface area, 20 by volume averages to 22”
Can a 20 high support 22” of fish? Probably.
Why does the 20 long support 3” more fish that the 20 high?
A larger surface area allows a greater oxygen exchange, which is as important as volume of water.
Large bodied fish, such as gold fish you need to double or even triple these numbers, i.e. 3 gallons per inch and 36 sq. in. of surface per 1” of fish.
This is not the only consideration for fish tanks. Types of fish will appreciate one type of tank over another. For example, fast swimmers like Zebra Danios, Pearl Danios and Blue Danios will do best in a tank that is at least 30” long. They would be better kept in a 20 long rather than a 25. Giant Danios would do best in a tank at least 48” long. They would be better kept in a 55 rather than a 65.
On the other hand, slow, tall bodied fish like Angel Fish and Discus will do best in a deep tank. They would be better kept in a 65 rather than a 55. They, like other cichlids also need a bit more than the 1” per gallon and/or 12 sq. in. surface.
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