Dosing with calcium carbonate?
I've got a 40 gal regular tank set up with gravel/Eco Complete substrate, 2x96 watt lighting and pressurized co2 w/ph controller.
My kh is only 3 (down from 5 last time I tested it about a month ago), and I'm wondering if I need to raise it a little to avoid a potential ph crash.
I ordered calcium carbonate from greg watson by mistake (meant to order potassium), but I haven't used it before and am not sure how to dose (nothing on Chuck's calculator on this).
Should I be doing something about this or is 3 within a safe range?