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Not doing water changes frequently enough.What Causes KH To Drop In A Freshwater Aquarium?.Use Limestone, Dolomite, or Aragonite as Substrate.

Perform water changes using dechlorinated tap water.How To Raise KH In Freshwater Aquariums | Methods.To adjust KH levels to the needs of certain fish species.Why Would You Need To Raise KH In An Aquarium?.What Is The Ideal KH Level For A Freshwater Aquarium?.How To Test And Measure KH In An Aquarium.What Is KH (Carbonate Hardness)? Why Does KH Matter In A Freshwater Aquarium?.This means your pH level will be less likely to fluctuate, ideal for fish health and the tank’s biological balance. The goal of increasing the KH level in a freshwater aquarium is to give the water an improved buffering capacity.

Higher KH acts as a replenishable buffer between the acids and your tank’s pH level, keeping the latter stable. Lower KH leaves pH levels vulnerable to major fluctuations. You can do this by adding crushed coral, aragonite, or store-bought alkalinity buffers into the aquarium water.Ĭarbonate Hardness acts as a blocker between the naturally occurring acids in a fish tank and the pH level. To raise KH levels in a fish tank, you need to increase the concentration of dissolved carbonates and bicarbonates in the water. This guide will show you how to raise KH in a freshwater aquarium! A bit of water chemistry insight will give you more control over one of the most critical water parameters: the pH level. This is at no extra cost to you.ĭistinguishing between GH (General Hardness) and KH (Carbonate Hardness) can be tricky for novice fishkeepers. As an Amazon Associate, I receive a commission if you decide to purchase through my links. DISCLOSURE: This post may contain affiliate links.