what causes high kh in aquarium

[Parsa0361]

Guys ,what causes high kh in aquarium?and how can make it normal.

 

[muzikalmatt]

I'm pretty sure the only way you'll have high alkalinity is either by dosing too much or using a salt mix that has a high alkalinity. I could be wrong, but I don't think there's a way for it to happen naturally.

 

[Parsa0361]

Do you think types of rock, are calcareous will make the KH goes up , or even Crushed coral which comes from dead coral reefs. Because it is high in calcium carbonate, crushed coral can help boost your tank's KH.

 

[Randy Holmes-Farley Verified Community Expert]

Do you think types of rock, are calcareous will make the KH goes up , or even Crushed coral which comes from dead coral reefs. Because it is high in calcium carbonate, crushed coral can help boost your tank's KH.

Not significantly. It does not dissolve at normal pH.

What is your alkalinity? What salt mix?

Tap water can add alkalinity.

Artificial cement rocks can add alkalinity.

 

[NeptuneRjo]

Are you using tap or rodi water?

 

[redfishbluefish]

What are you dosing? If you're using a "pH boost" product, that will also raise KH.