Thats a pretty complicated calculator IMO so I'll add 1ml of amm and then test 30 mins after and see where I'm at and go from there. Someone earlier in the thread said I should need 2.25ml to get to 3ppm. But it could always be different.Good job....now you CAN follow the ammonia calculator here for precise dosing....Is the Ace amm 10% ammonium hydroxide, like it was years ago when I bought mine?