i'm using mr aqua CR, so far so good, use for near 5 years already.
what brand of cr did you bought? i used before those cheap and unknown CR, those increase the ph.
do you have activated carbon in your filter? activated carbon do increase ph a little.
if you got budget, you can try biohome+ or biohome. if not some famous brand like mr aqua, anz, powerhouse, all not bad.









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