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so what happened? any update

about 1 bps or 1 per 2s in a 30l . I've been running this for quite a while now almost a year. Never did bother test for ph cuz i dont see any problems with the fishes. Fishes that are in rn are 1 betta, 1 cherry barb, 2 danios. Only reason why i bought the ph pen cuz it was cheap and i was...

Hi I just tested my aquarium's ph and got a reading of around ph 4. This was using a newly bought cheap ph pen from china. Tap water is ph7 and when tested, i do get 7. My tank is co2 injected btw. Can fishes even live at this ph level? My fish are doing fine, no signs of stress. Maybe my ph pen...