Kh high calcium low?

I have been using Kent marine ab to keep my levels normal and have had no issues until now. I bought a new test kit and had the lfs back my numbers up so they should be correct.
Kh 18
Ca 360
Ph 8.0
Nitrate/trite 0
Ammonia 0
Phos 0

How do I balance out?

I've also had a little out break of gha








Kh

 

Water changes or just add Ca until it reaches 400-420 and your alk drops to around 10.

 

Curious, do you have a mag level?

How how often are you adding the a/b ?

 

I was doing it every other day and everything remained stable then a few days ago kh shot up and now today ca dropped. Very strange

Mag was 1350 if i remember right

 

could your old test kits have been off? I agree with 2in10. I would do water changes to bring the kh down and then start adding calcium.

 

Just looks out of balance to me. Bring the Ca up, and the Kh will drop, as everyone else has said.

 

It's possible, but the old and new test almost the same.

I initially thought the old one went bad so I bought the new but lfs confirmed my numbers

How do you suggest raising ca?