Most riverine fish (like beanii) are evolved to handle pH shifts (sometimes drastic ones).
During rainy season the pH often drops drastically, and during dry season does the opposite.
I live near lake Gatun, and because of the influx of sea water from the usage of the Panama Canal, and monsoon rains inundating the Chagres River, pH can go from below 6 to above 9 in moments, and with the same fluctuations in conductivity, and TDS.
Even the feral P-bass thrive.
During rainy season the pH often drops drastically, and during dry season does the opposite.
I live near lake Gatun, and because of the influx of sea water from the usage of the Panama Canal, and monsoon rains inundating the Chagres River, pH can go from below 6 to above 9 in moments, and with the same fluctuations in conductivity, and TDS.
Even the feral P-bass thrive.