my search from those who breed successfully has even a GH of 12 or higher. They say the most important fact is water temp of 28-30 degree and ph of above 8. I have read that successful breeder has GH ranged from a low 4 to high 12, so i guess GH might not be a factor here.
going to grab a Ph test kit from C328 later, and MineralPlus to see if it help
Actually the last 4 cardinal in my tank has been survival for quite a while already. just that they are not breeding. my guess is survival of the fittest, the weak has been terminated due to poor transportation condition from Indonesia
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