Best aquarium decor to raise an aquarium’s pH Texas Holey Rock Natural Limestone Aquarium Decor: available at Amazon Driftwood naturally lowers pH levels in your aquarium.

An acidic pH level is anything below 7 down to 1. Therefore, if you need to raise your pH in your aquarium, it’s more often than not because the water has become acidic.

Climate change is making ocean water more acidic. A new study suggests that a drop in pH could erode sharks’ teeth.