with a gravel underbed? I have 1.5 cu ft right now in 10 X 54 tank with a Fleck 7000 unmetered valve. I realize those 6 GPM bath fills and a few other occasions are somewhat over the service flow rate.

I can't smell chloramine anymore, although that isn't scientific. Any recommends on accurate, but reasonably-priced chloramine test kit? I mean, if it is $50 for the test kit I may as well buy another 1/2 cu ft of Centaur . . .

Can I run 2 cu ft in this tank?