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Discussion Starter · #21 ·
It was gravel from pet store that shouldnt release anything, but my tap water has 22ppm Calcium and the tank ended up at 60ppm :eek: Calcium with that substrate.
The substrate released chalc and other things in the big way and the tank got at last a very bad Ca:Mg ratio in conjunction with high KH/GH (hardness).
I replaced the bad substrate with ADA Africana and everything was quickly fixed.
 
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