Originally Posted by SeaHorse_Fanatic (Post 906308)

For your tank's salinity to jump 4 points like that, it means your change-water salinity was WAAAAY HIGH, probably in the high 30s. That would do it for sure. Especially if at that high a salinity the water temp was off and the salt was not fully mixed.

For instance, if you did a 33% of total water volume change and your tank salinity jumped 4 points, then you were 12 points too high or 1.037 in the bucket.

If it was a 20% water change, then your bucket was at 5 times four points too high or 20 points (i.e. 1.045 salinity).

Pouring in a large volume of super saturated high salinity water will definitely lead to some of the issues you've listed.

Anthony