Handy tools to help you plan your tank — from sizing your water volume to picking fish that get along.
Enter your aquarium dimensions to instantly get the water volume in litres and gallons — accounting for glass thickness, substrate, and fill level.
A large interactive chart showing which popular aquarium fish can live together safely. Check any pair before stocking your tank.
See how many fish your tank can safely hold based on adult sizes and the 1 cm per 1.5 L rule — with group-size warnings for shoaling fish.
Estimate dissolved CO2 from KH and pH, check if it lands in the ideal range, and get a rough bubble rate for your planted tank.
Calculate the weekly grams of KNO3, KH2PO4 and K2SO4 you need to hit your target N-P-K levels, with low/medium/high presets.
Pick the right heater size from your tank volume, room temperature and target temperature — including a two-heater setup for big tanks.
Find the filter flow (L/h) your tank needs based on volume and bioload, and check whether your current filter turns the tank over enough.
Work out the litres, kilograms and number of bags of substrate needed for your tank footprint and desired depth.
Safe glass thickness for a DIY aquarium, based on length and height — with top-brace guidance for long tanks.
Convert between Celsius, Fahrenheit and Kelvin and see which fish are comfortable at that temperature.
An interactive aquarium care routine from daily feeding checks to quarterly deep cleans — with progress saved on your device.
Calculate how many litres to remove for a partial water change and the dechlorinator dose you need for the fresh water.
Find the right lumens and wattage for your planted tank based on volume and whether you want low, medium or high light.
Mix RO/DI water with tap water to hit a target hardness or TDS — essential for soft-water fish, shrimp and discus.
Estimate daily food from your fish's adult size and numbers — with grams, pinches and feeding frequency.
Enter your water hardness and temperature to see which popular fish naturally suit your tank.