Water Quality

[anglfish]

this is weird. remember how I complaint about too low ph (7.8-7.9) due to low quality salt....

now I suddenly have a ph of 8.8.

after a water change last Thursday I had top water over the whole weekend (0 ammonia and nitrite, 0-5 nitrate, 8.1 ph). I took another meassurement on Monday and ammonia, nitrite and nitrate still were great but ph was up to 8.4. Did another waterchange yesterday to make sure that quality stays good and ph doesn't go up... but today the ph is at 8.8. (ammonia, nitrate and nitrite still reamins 0).

Why? How can I get it down? what is the cause?

I'm going to try finding some articles about that but I'm sure you experts out there know exactly what's wrong - don't you?

let me know if you need more info.

thanks,
Ang