How to maintain kH

[kamarul]

Hi I have been a patient reefer for about 2 years now and have finally been able to keep 3 colonies of acros, 2 polop colonies and 2 mushrooms. Everything is going great but I have to add in Seachem kH plus almost every 2 -3 days! Is there any other ways besides this? Thanks for any help.









Hobby Experience: 2years
Current Tanks: 55 gallon