17-20k gallons, absolutely crystal clear, still a couple black algae dots under the de-laminated/bulging plaster, but everything brush-able has long been killed.
FC 9
CC 0
PH 7.4 (1 drop to 7.2, 2 drops to 7.0)
TA 60
CYA 50 (rounded up from just under)
CH 200
Old, pitted, some de-laminating...