Standard UK Tank Capacities and Stocking Levels
The guidelines for stocking levels in the UK are usually based on either 1" of fish per UK gallon of tank water up to six months,
and up to a max of 2" of fish per gallon thereafter, or calculated from 1" of fish per 12 square inches of surface area
(note that this is not the same as 12 inches square!). Using the first guideline, your stocking capacity in total inches of fish length
is equivalent to the volume in UK gallons below, or twice that as a max in a mature tank. The stocking levels based on
surface area are quoted in the table - note that these usually give a higher number (except for tall tanks) than the volume calculation,
and should be considered a maximum.
The tank capacities below have been calculated allowing for a fill level 1" from the top, and a 1" depth of substrate.
Tank Size | Imp gal | US gal | Litres | Max. inches of fish based on 1" of fish per 12 sq." of surface area |
18x12x12" (45x30x30cm) | 7.5 | 9 | 34 | 18 |
24x12x12" (60x30x30cm) | 10 | 12 | 45 | 24 |
24x12x15" (60x30x38cm) | 13 | 16 | 59 | 24 |
24x12x18" (60x30x45cm) | 16 | 19 | 72 | 24 |
36x12x15" (90x30x38cm) | 20 | 24 | 89 | 36 |
36x12x18" (90x30x45cm) | 24 | 29 | 108 | 36 |
36x15x18" (90x38x45cm) | 30 | 36 | 137 | 48 |
48x12x15" (120x30x38cm) | 26 | 31 | 119 | 48 |
48x12x18" (120x30x45cm) | 32 | 38 | 144 | 48 |
48x15x18" (120x38x45cm) | 40 | 48 | 182 | 60 |
48x18x24" (120x45x60cm) | 65 | 79 | 297 | 72 |
48x24x24" (120x60x60cm) | 87 | 105 | 396 | 96 |
60x15x18" (150x38x45cm) | 50 | 60 | 228 | 75 |
60x18x18" (150x45x45cm) | 59 | 71 | 270 | 90 |
60x24x24" (150x60x60cm) | 109 | 131 | 495 | 120 |
72x15x18" (180x38x45cm) | 60 | 72 | 274 | 90 |
72x18x18" (180x45x45cm) | 72 | 86 | 324 | 108 |
72x24x24" (180x60x60cm) | 131 | 157 | 594 | 144 |
84x24x24" (210x60x60cm) | 153 | 183 | 693 | 168 |
96x24x24" (240x60x60cm) | 174 | 210 | 792 | 192 |
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