Hi there, I am suprised that no planted tank experts had advised you.
I am not a planted tank guy, I like fish, specifically small size fish. For cardinals and rummynose where the native ph is acidic to slight acidic, you wouldn't need coral chips.
By the way, personally 50 cardinals + 30 rummynose is way bio-overload for a 2ft tank in my opinion. That's probably why your cardinals feel distressed. It's like a mini hong kong housing.









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