pH problem.

[michika]

Having some sudden and what seems to be unexplained pH problems. Everything was fine on the 25th pH 8.2, ammonia 0, nitrite 0, nitrate 0, calcium 460ppm, and SG 1.023.

Yesterday evening and still today the ph has dropped to 7.8-7.9, calcium moved up to 480ppm, SG 1.024 and everything else is still at zero.

1 29g tank running in tandem with a 10g along side. Only big change that has occured has been a water change (Kent salt), and the addition of a new anenome.

Ideas on what is causing this pH drop? Everything seems fine right now so I'm hesitant to add anything without knowing what is triggering this drop on pH.