Exposing it for that time wouldn't hurt it.
Your calcium is really high, are you dosing calcium? What salt are you using?
Now I can tell you the white cloud is likely precipitated calcium. Water can only hold so much, then it turns into a solid, which would appear white which sounds like what you are describing.
But your Ph is in line, so that is good.
I would go get a different brand of salt right away, mix it heat it aerate it, and transfer your animals right away.
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