Mg and KH are depleting fast?

[Bluetang]

Realise that my tank's Mg and KH are depleting very fast! Where Calcium is quite high, last tested at 500. Beside water change, what other things that I can do to keep the parameters constant. I use Tropic Marin saltmix. txs

[Diesel3443]

add supplements thats it. Cacification is up so they are being depleted, also check your salinity and make sure it is .025-.026. if its lower it can cause mg to be low

[Orion76]

Realise that my tank's Mg and KH are depleting very fast! Where Calcium is quite high, last tested at 500. Beside water change, what other things that I can do to keep the parameters constant. I use Tropic Marin saltmix. txs

What method do you use to maintain Ca & Alk?