I run a 60 gallon , medium stocking. I use all for reef . Started with a 5 ml dosage then started noticing that it wasn’t enough so increased to 8 ml which also wasn’t enough ( 6 dkh using slaifert ) increased to 12 ml (recommended dose) same issue ( also 6 dkh ) . I am afraid if I keep increasing the dosage that I will end up with a tank crash . The alkalinity doesn’t seem to increase not even a bit . At this point I don’t know what’s the issue ; my test kit , my dosing pump or all for reef . I have been using All for reef for about 6 months with no issues until now .