I use wall water PH7, suddenly my water is PH5. I didn't tested my water 6 months, because my water always PH7. I wonder why ?
My tanks is 5 gallon a Betta fish, snails, IAL,live plants, two pots and small filter.
I change water 0.5 gallon everyday.
Temputure is over 80F, GH7 and KH2.
My fish always has fin-rot or turn red.
I add pet moss a few days ago. And I also add crushed shell a little bit, I am afraid if my PH is high then.
Do you have any idea why my PH is down ?