Water cloudy problem after water change

[zonda]

Recently I changed my salt to Red Sea salt for a month and I find out that after water change for 1 day the water will be cloudy as below, I change my water from the sump so shouldn’t be related to my sand, I read some post it might be related to calcium settling with the water, not sure what it means and how it works

parameters
Salinity 1.025
Ph 0.05
Nitrate 5ppm
Alk 8

i don’t have a Cal and Mag test kits since most of my Corals is LPS

any thoughts will be appreciated

 

[Butuz]

Could also be a bacterial bloom, if you are doing large volume changes.

 

[zonda]

I do about 20-25% change every week will it be too much?

 

[Butuz]

Potentially. If the corals are happy, your core parameters are stable, then increases the likelihood its a bacterial bloom. Should clear in a few days.