Jump to content

Wonder Shell Time to Affect Hardness


Recommended Posts

How long does it take for a Wonder Shell to have an effect?

Prior to the addition of a small Wonder Shell to a 10 gallon tank, my dGH was ~6 and my dKH was essentially 0. After the addition of the Wonder Shell and waiting 24 hours, my dGH was about 6.5 while my dKH was still essentially 0.

Should I expect a rise in dKH in a 24 hour period?

Would my plants be absorbing the extra minerals released by the Wonder Shell hence the apparent failure to raise the calcium hardness?

Thanks in advance for your input.


Link to comment
Share on other sites

26 minutes ago, Cory said:

Wondershells will raise your GH, but shouldn't raise your KH. 

I get this question a lot too. To raise the KH (assuming your water source is insufficient to increase it with water changes) you need to add natural buffers such as crushed coral, Aragonite sand, dolomite or soda ash.

I always suggest either crushed coral or Aragonite sand in addition to the substrate or instead of it all together (depending on how much you are trying to raise it).

  • Thanks 1
Link to comment
Share on other sites

  • 2 months later...

There was a good discussion of GH in this blog post:


pH, GH, and KH are terms commonly used in water chemistry, but there is a lot of confusion surrounding them in the freshwater aquarium hobby. This...

Basically, if your shrimp are having trouble molting, or your snails have thin or pitted shells, or your plants have a calcium deficiency, you might want to raise your GH a bit.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Create New...