Estes Gravel Natural Shallow Creek 5lb Fertilizers The biggest advantage is the

The biggest advantage is the ability to know exactly how much product to add in order to achieve any calcium level while restoring other essential ions

accurate water testing

05 mg/L (ppm) free ammonia and alerts you to the #1 killer before any sign of stress

They contain essential trace elements

Estes Gravel Natural Shallow Creek 5lb Fertilizers The biggest advantage is theEstes Gravel Natural Shallow Creek is a substrate for use in aquariums. This 5lb bag of gravel is natural and non toxic, making it ideal for fish and water gardens. It adds a subtle hint of color to your aquarium while providing an optimal environment for beneficial aquatic bacteria.