Hardness

Aquarium Rocks That Raise Hardness and pH

Identify mineral-rich rocks that can change water chemistry and decide when that effect is helpful or risky.

Learn what general hardness measures and why calcium and magnesium levels matter to fish, shrimp and plants.

GH measures dissolved calcium and magnesium — the minerals that shape osmoregulation for fish, shrimp, and snails. Here’s how to test and manag…