Aquarium calculator

Freshwater water-parameter checker

Enter temperature, pH, GH and tank dimensions to find environment matches in the reviewed catalogue.

Use tested, settled source water

Your aquarium envelope

Enter actual internal dimensions and recent stable readings. The checker does not recommend chemically chasing a number.

38catalogue profiles currently inside every entered limit

Water volumeLTank lengthcmTemperature°CpHpHGeneral hardnessdGH

25°C temperaturepH 7 acidity8 dGH hardness100 L volume80 cm length

Environment matches, not stocking recommendations

Profiles closest to these conditions

Behaviour, social structure, bioload and combinations must still be checked in the stocking calculator.

SpeciesTemperaturepHGHSpaceResult

African dwarf frog22–27°C6.5–7.85–15 dGH40 L · 45 cmInside limits Amano shrimp20–27°C6–7.84–15 dGH30 L · 45 cmInside limits Assassin snail20–28°C6.5–85–20 dGH20 L · 30 cmInside limits Bamboo shrimp23–29°C6.5–7.84–15 dGH75 L · 60 cmInside limits Betta fish24–28°C6–7.53–12 dGH20 L · 45 cmInside limits Black neon tetra20–28°C5–7.51–12 dGH72 L · 80 cmInside limits Black skirt tetra20–27°C6–84–18 dGH75 L · 75 cmInside limits Bolivian ram23–28°C6–7.82–15 dGH90 L · 75 cmInside limits Bristlenose pleco22–28°C6–7.83–15 dGH100 L · 80 cmInside limits Bronze corydoras22–28°C6–82–20 dGH75 L · 75 cmInside limits Cardinal tetra24–30°C4.5–71–8 dGH75 L · 75 cmInside limits Celestial pearl danio20–26°C6.5–7.84–15 dGH45 L · 45 cmInside limits Cherry barb22–27°C6–85–20 dGH60 L · 60 cmInside limits Cherry shrimp18–27°C6.5–86–20 dGH20 L · 30 cmInside limits Chili rasbora22–28°C4–71–8 dGH35 L · 45 cmInside limits Dwarf gourami24–28°C6–7.53–15 dGH60 L · 60 cmInside limits Dwarf Mexican crayfish18–26°C6.5–86–20 dGH40 L · 45 cmInside limits Ember tetra23–29°C5–71–10 dGH45 L · 45 cmInside limits Ghost shrimp18–27°C6.5–85–20 dGH25 L · 35 cmInside limits Glowlight tetra24–28°C5.5–7.52–15 dGH60 L · 60 cmInside limits Guppy22–28°C7–8.28–25 dGH40 L · 45 cmInside limits Harlequin rasbora23–28°C5–7.51–12 dGH60 L · 60 cmInside limits Hillstream loach20–25°C6.5–85–15 dGH75 L · 75 cmInside limits Honey gourami23–28°C6–7.53–15 dGH60 L · 60 cmInside limits

Match fish to stable source water

Use settled readings from the real aquarium. Choosing animals already suited to the water is generally more robust than repeatedly changing chemistry.

Read the chart correctly

Inside every limit means the entered temperature, pH, GH, volume and length fit one profile. It does not mean every matching species can live together.

How to use this result

Enter the internal water dimensions or planning values you can verify. Treat the result as a starting estimate, then compare it with the aquarium, equipment and livestock manufacturer’s documentation where relevant.

Assumptions and rounding

Metric values are calculated first and displayed to a practical precision. Advertised tank volume can exceed real water volume because glass thickness, substrate, hardscape and the air gap displace water.

Worked planning example

For an 80 × 35 × 40 cm internal rectangular space, gross volume is 112 litres before displacement. A realistic water volume may be lower, so equipment sizing and water-change preparation should preserve a sensible margin.

Limitations

Shape approximations, pump head, room temperature, lid design and the density of natural materials all affect real-world results. No equipment calculation overrides the care needs in an inhabitant profile.