Any ways to increase hardness of water?

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ladycage

Aquarium Advice Apprentice
Joined
Feb 2, 2007
Messages
31
I now know that adding baking soda to the tank increases PH but is there anything that will harden the water?

I have tropicals: betta, tetra, swordtails, platys, mollies, cory cats, giant danio and bala sharks in a 75 gallon tank. I read that they need hard water but once I added the baking soda my water is now soft so what can I do to harden it.
 
I would stop adding the baking soda all together and put crushed coral in the filter. This will also increase the pH too.
 
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