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Re: KH 5 - GH 1.5

KH bigger then GH is a quite unusual ratio.
In nature, this is very rare and even then it is an illusion !
Try to go for ratio where the KH is about 75%-80% of the GH,
in this case, plants & FISH will be happy.
Calcium is what makes about 80% of the GH, therefore your tank
could be calcium limited,
Try to raise the GH to about 7-8 with...
Liquid Calcium
Shells, etc.
without raising the KH .