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API GH Test


amtiskaw

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Does anyone else have trouble seeing the colour change in API GH test kits? It's supposed to go from orange to green, but I can't see the difference :smln:

I'm pretty sure I'm not colour-blind - according to this online test, I'm not.

The kit's only about four months old and the kH test that it came with is fine :-?

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Yes i had this problem. Even halved the sample and skirted half a bottle in to try and prove a point, still no colour change. Took it back and got a new bottle, which worked sweet. The GH test doesnt have as longer life as the KH tests. Mine had expired on the shelf in the pet store.

Note the last couple numbers stamped on the bottle. That is the year it was made. You have 3 years after that before it expires.

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