Question on GH

[boarky]

Hi all,

I've a 3 wks old tank and experiencing some issues with rocket high GH reading 180ppm on API 5-in-1 test strips. There are 3 small rocks in the tank and I am unsure if it is the contributing factor. Did a water change to in hope to lower the GH but it didn't really drop much.

Question:

1. Could the high GH be also contributed by sg tap water? I did not add any anti chlorine.
2. If the rocks are contributing factor, then are we able to "season" the rocks like soaking it in water for several cycles?

Hope to get some advice here. Thanks!

Boarky

[laban]

ok firstly, please put up a picture of your rocks.. so that everyone can help you identify. my guess your rocks do contribute to your high GH, which some of us do experience too
you can try to take out the rocks and measure your GH again after few days.. see if GH drops. if it drops, then u know what cause your high GH..

[boarky]

Thanks for the advise. Rock as attached.

[boxedfish]

hi, take out the rock, pour some vinegar on it. if rock have bubbles, high chance it will leech minerals into your water causing higher GH

[NingNing]

looks alot like granite.

such rocks don't only affect your gh but kh as well.