How to use Sera GH test kit?

[wong1979]

I just bought a GH test kit that comes with a bottle and reagent only.

The instruction says to test 5ml of aquarium water and add reagent drop by drop. I added the 1st drop, its turns to light green. Then on the 2nd drop, it turns into brown. 3rd and subsequent drop remains brown.

So does that mean my water is very soft between GH 1-2?

I am keeping CRS and the recommended GH is 6.

Is it safe to keep adding mosura mineral plus (in a slow gradual process) to get GH 6?

[wong1979]

After re-reading the instructions, I realised that I need to keep dropping until it turns to green.

I was shocked when it turned green only after 15 Drops.
So I supposed my GH > 15

Is this a potential risk to my CRS? What should I do now? Is peat moss safe to use for CRS?

I measured my tap water, it was about GH 4.