I live in the Seattle area where the water is soft, around 2-3 degrees GH out of the tap.
I have two high tech tanks, a 29 gallon and a 10 gallon. Both have something that is causing the GH to skyrocket and I am not sure what it could be.
My 10 gallon has the highest hardness, I stopped counting at 45 drops from my test bottle!
Nitrates: ~50ppm (I never can read the color chart)
Substrate: Seachem Flourite Black and black aquarium gravel (have this same substrate in a low tech tank w/ normal, low GH)
Hardscape: Driftwood, slate stone
My 29 gallon tested around 17 degrees GH
Nitrates: ~50 (again, it was red)
Substrate: Seachem Flourite Red and small rock from the aquarium store
I feed with Simple Green from Aquarium Co-Op in Edmonds (2x per week) and run 2-5bps CO2 per tank.
Any insight or help into figuring out what is causing the GH to skyrocket in these two tanks would be extremely helpful!