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Relatively High pH
I am experiencing a relatively high pH which seems at odds with my
tank's condition. The pH is 7.2 - 7.3. The tank is a 29 gal with
about 9 Cardinals, 6 gold tetras, 4 Marble Hatchets, 3 Otocinclus, 1
Farlowella, 1 fairly large Java Fern, 1 Anubias Nana, approx. 14 Val.
spiralis, 3 Amazon swords, 1 medium c. wendtii. I also have 2 pieces
of bogwood. My GH is at 10ppm, KH at 10ppm. I use an Aquaclear
power filter. The substrate is inert gravel (CongaRock). Nitrates
are a bit high right now, at around 20 ppm.
With the fish load and the bogwood, and no mineral sources, what
could possibly be keeping the pH at that level? I would expect I
would be fighting a drop in pH! My tapwater (Seattle) measures
dead-on at 7.0, with very low GH and KH. My pH test kit is brand new
(Aquarium Pharmaceuticals). TIA!