How to permanently increase water hardness

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How to permanently increase water hardness

The tap water is too soft, and the shrimps are always shelled to death[kun]Is there any way to permanently increase the hardness of the water? Dongguan City, Guangdong Province========How did the fish friends of the Xianglong Aquatic Alliance comment==

  With Zean? Yuyou said: Blue Dragon Stone.I really envy the soft water
Red Dragon Yiyou Yuyu said: I heard that adding colored stones can always harden
Yueyue, Yuyou said: There is never a thing. Shrimp farming should be patient. Follow me to see it. I have to say how to improve
Fengshen hh Yuyou said: coral block or adding mineral water (chemistry teacher taught me)

How to permanently increase water hardness Green Pepper Red Dragon
A few red yuanbao fish are usually kept:
Ingot parrot fish(
Is the red ingot fish a parrot fish?)
Ingot fish and parrot fish, which is more expensive.
Ingot fish fed several times a day~

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What species of fish?

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