becoming more acidic. I finally got a pH test last night and tested my tap water, it was 7.4 which would have been right. I then took the results of my 112 litre tank, it was 6, but what I dont understand is why is my water more acidic. The tank has a filter, a heater and a thin layer a gravel. The rest of my tanks are about 6.4. And only have gravel, heaters, filters, water and fish. I havnt played with my waters chemistry. Is it leftover food that is causing this?
thanks