<p><strong>Fig. 2.14.</strong> A hydrometer used to determine water densities in g/mL. The pink shaded region indicates the optimum density of saltwater aquaria at an average temperature of 20˚C to 25˚C.</p>

Fig. 2.14. A hydrometer used to determine water densities in g/mL. The pink shaded region indicates the optimum density of saltwater aquaria at an average temperature of 20˚C to 25˚C.

Image by Byron Inouye