Problem at the display tank.

[Ahku]

This happen when I finish doing my waterchange. In the water I added salt from red Sea and added ph and this happen. Any reefer can help? 

[xeneryx]

Do u mean the cloudiness?

adding ph will cause it. Should be fine after awhile.

[Ahku]

it's not the water. the cloudiness stick on my display tank. i trying to brush it or scrape it. it won't go off. i thinking to use metal scrape to do