Fish Tank Stocking Calculator

Go beyond the outdated "inch per gallon" rule. Calculate realistic bioload limits, verify temperature and pH compatibility, and assess species aggression.

1. Select Unit System

2. Tank Specifications

Volume calculation mode

Tank Size (US Gallons)

5G (Nano)55G (Medium)180G (Monster)

Substrate & Decor Reduction

-10% Volume

0% (Bare bottom)10% (Average decor)25% (Heavy aquascape)

3. Filtration Parameters

Filter Type

Filter Capacity RatingRated size in Gallons

Filtration Capacity Efficiency: 1.50xOver-filtering (using a filter rated for a larger tank) effectively boosts bioload tolerance.

4. Add Aquarium Inhabitants

Select Fish Species

Qty

Adult Size1.5" (4 cm)

Temp Range72°F - 78°F

pH Range6 - 7

Bioload LevelLow (0.4x)

Current Tank Occupants

Species	Adult Size	Bioload	Quantity	Action
Neon TetraParacheirodon innesi	1.5"	0.4x	6
Corydoras CatfishCorydoras aeneus	2.5"	0.8x	4

5. Stocking Diagnostics

Adjusted Stocking Level43%

Effective Water Volume18.0 Gal (68 L)Gross Volume20.0 Gal

Calculated Diagnostics

Total Fish LengthSum of adult sizes

19.0" Total Inches

Traditional Stocking Rule"1 Inch of Fish per Gallon"

95%

Base Bioload IndexBiological waste points

11.6 Pts

6. Weekly Water Care Advisor

Weekly Goal15% Water Change

Light stocking. Very stable parameters.

Compatibility Alerts (1)

Corydoras Catfish is a schooling species and should be kept in a group of 5 or more to prevent stress (currently stocked: 4).

7. Aquarium Stocking Visualizer

Active swimming animations

8. Export Stocking Sheet