How to drop down Ca and Kh?

[serega]

Hello all I have problem in new tank, Ca 500 Kh13 how to safetly drop down this numbers?

 

[little_fish]

water changes, but unless you have very sensitive SPS corals, it wont hurt anything in your tank

 

[ccCapt]

What brand salt are you using? Some salts do come with the ca and alk that high so if you are using something that mixes that high to begin with, doing water changes won't drop it.
Are you dosing anything?

 

[serega]

I just start tank 4 weeks ago and did mix with chippest instant ocean brand come in box for 200 gal mix, I have about 150lb rocks 120lb sand and 20lb crushed corals, may be that corals bring lvl of Ca so High?
Water change not help it comes same lvl.

 

[serega]

Today did test salt that I use and mix show Ca 540 that where to come from.
Meter Red Sea salt mix showing Ca 440 so 100 points differents