How much KH Coralline Gro

[Carlos781]

Please help I am using the reef mature starter kit from Red Sea, the instructions say to test ph and kh\alkalinity. They both came back low, with dKH being 6.9 it says to add KH Coralline gro to increase greater than 8.4 dKH but I’m not sure how much I add

 

[Ron Reefman]

Just start with a small amount, maybe 10ml and retest the tank after a few minutes. Based on how much the dKH goes up, you can estimate how much more to add (be conservative).