Category:
fish-tank-water-salinity-and-hardness
The optimal hardness level for fish tank water depends on the species of fish you have. Generally, a hardness level of 100-250 ppm (parts per million) is suitable for most fish.
The optimal hardness level for fish tank water depends on the species of fish you have. Generally, a hardness level of 100-250 ppm (parts per million) is suitable for most fish.