Educational biology and modern aquaristics
in French in Spanish

Saltwater aquarium calculators:

Summary :
Share :       
Clean-up crew (detritivores) quantity and selection for a saltwater aquarium Hans-Werner Balling supplementation: method dosing calculations Aquarium Magnesium supplementation: dosage adjustment Simplified equation of state: seawater density and salinity calculator Equation of state of seawater: density, salinity, conductivity, pressure... (IES 80 - full version)

Clean-Up Crew (Detritivores) Quantity and Selection for a Saltwater Aquarium

 Gross aquarium volume:liters (l)  If Yes, enter the sand bed area:
 Do you have a sand bed? Yes  No   Aquarium length: cm 
 Aquarium width: cm 
If No, will you keep hermit crabs?
  Yes  No 
 Do you have fine red and/or green turf algae? Yes  No 

Recommended clean-up crew (detritivore) composition for your aquarium:
  snails, including  Strombus/Cypraea annulus 
  hermit crab(s)   crab(s) 
  brittle star(s)   sea star(s) 
  sea urchin(s) 

Hans-Werner Balling Supplementation: Method Dosing Calculations

Enter your aquarium's actual net water volume, your measured calcium concentration, and your target calcium level.
The required weights of calcium chloride and sodium bicarbonate to add are calculated, along with a recommended dosing duration.
Actual water volume :liters Measured calcium :mg/l
Target calcium :mg/l
Pure "Balling" Method
(strict method)		  Chemical compound to add 
(weight in grams)		 Modified method with additional
Magnesium supplementation
g : CaCl2 x 2H2O : g
MgCl2 x 6H2O : g
g : NaHCO3 : g
g : NaCl-free sea salt (without NaCl) : g
To maintain ionic balance, you must remove from the aquarium :
g : marine sea salt : g
Calcium chloride and sodium bicarbonate must never be mixed together directly!
Dose all solutions over the same period (separately) across approximately days.

Aquarium Magnesium Supplementation: Dosage Adjustment

Enter your aquarium's actual water volume, your measured magnesium concentration, and your target magnesium level.
The required weights of magnesium chloride hexahydrate (MgCl2 x 6H2O) and magnesium sulfate heptahydrate (MgSO4 x 7H2O) are calculated, along with a recommended dosing duration.
Actual water volume :liters Measured magnesium :mg/l
Target magnesium :mg/l
 MgCl2 x 6H2O : grams  +   MgSO4 x 7H2O : grams
Magnesium chloride hexahydrate and magnesium sulfate heptahydrate should be dosed simultaneously over
a period of approximately days.

Simplified Equation of State: Seawater Density & Salinity Calculator

Enter either salinity or density along with water temperature (from 0 °C to 40 °C). Pressure is assumed to be 0 (at the surface).
Salinity:‰ PSU Temperature:°C  => Density: g/l (± 0.1 g/l)
or(Note: salinity between 0 and 42 PSU, density > 1000 g/l)
Density:g/l Temperature:°C  => Salinity: ‰ PSU (± 0.1 PSU)

Enter salinity, temperature (from 0 °C to 40 °C), and pressure in decibars (1 decibar = 0.1 bar = ~1 m depth).
Salinity:‰ PSU Temperature:°C Pressure:dbar  => Density: g/l (± 0.1 g/l)

Equation of State of Seawater: Density, Salinity, Conductivity, Pressure... (IES 80 - full version)

In the first row, enter either depth or pressure and check the corresponding box. In the second section, enter any 2 values and select their associated checkboxes.
Select and enter 1 of the following 2 values: the missing value will be calculated automatically.
 ~Depth : m   Pressure : dbar 
Select and enter 2 of the following 4 values:
(the 2 remaining values will be calculated automatically)
 Temperature : °C   Conductivity : S/m 
 Salinity : ‰ PSU   Density : g/l 
Results with an adiabatic lapse rate of mdeg/dbar
 Speed of sound : m/s   Specific heat : J/(kg °C) 
 Freezing point : °C   Potential temperature : °C 
NEW : Convert conductivity to TDS (Total Dissolved Solids).
Depth and pressure are related using a simplified approximation for a standard ocean at 0 °C, a salinity of 35‰ PSU, and a latitude of 30°, accounting for variations in gravity.
The underlying equations are valid for temperatures from -2 to 40 °C, pressures from 0 to 10,000 decibars (1,000 bars), and practical salinity from 0 to 42‰ PSU.
Based on the UNESCO International Equation of State of Seawater (IES 80) as described in JGR, vol. 90, no. C2, pp. 3332–3342, March 20, 1985.