Weird buildup on glass

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Aquariusy

Aquarium Advice Newbie
Joined
Feb 27, 2020
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I recently purchased a 65 gallon aquarium and filled it up. I decided to boil a rock from outside and put it in the aquarium. When I woke up the next morning there were little white specs all over the aquarium glass. I scrub them all off, but then the next day they all came back like a small fine powder all over the glass. Could it be hard water even though it’s underwater?
 

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What types of additives have you used, ferts or dechlorinator, etc.?

What is the water pH?

I have had a powdery white film, but not specs of white film on glass before. Are you feeding more than the fish are eating? Are there fish?
 
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