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Problem One - high pH. My tank used to have a pH between 7.2 and 7.6, however it has gradually increased to 8.4! I did a 10% water change, vacuumed, and changed the carbon filter. HELP!! (side note: it doesn't seem to be bothering the fish)

Problem Two - tannin. My cholla wood has turned the water a nice yellow/brown (sarcasm, it looks gross, clear but gross). I presoaked the logs for days and added one at a time to the tank. The first two didn't change the water, however after I added the third, I started to notice a color change. (again side note: it doesn't seem to be bothering the fish)

Any help would be greatly appreciated!

Aquarium Parameters

Temperature - ~80F Ammonia - 0

Nitrate - 0 Nitrite - 0

pH - 8.4 TDS - 350-420