How much should fluorite and/or pagoda stone raise GH? (Understanding that it is two separate issues).
I have heavily planted 37g with 75/25-fluorite/gravel base. 20 lbs. of pagoda stone (sandstone?)
It appears that I am getting about 1-2 DH bump in GH. My tap H20 runs about 7.2 pH, 4.0 kH & 6 GH. After treating the H20 with D. buffer to a pH of 6.4, and adding to the tank, the GH is in 7 range increasing to 8-9 after about 72 hours.
1. I understand that pagoda may be sandstone, with a Fe base. Does pagoda have a Fe base, which may contribute to ion exchange? The Fe base would explain the nice reds and the weight of the stone and increase in GH Are my thoughts correct?
2. Is the fluorite or the pagoda stone the contributor to the increase? My guess is the pagoda stone.
Am I pointing in the right direction? If the fluorite raises GH the 1-2 GDH it will save me a bit of work tearing up my tank to remove the pagoda stone.