What are these dots ?

Guyb93

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I have loads of dots on the inside of my glass they are almost transparent with a slight white tint my water is ok test results show Gh 120
KH 50
7BDE6E0D-7DDA-4DC3-A4D6-DD2142A9D32D.jpeg

Ph6.5-7
NO2 0
N03 20-40
, my NO3 maybe slightly high
I’m just not sure what they are they come off easy enough with the magnet cleaner
 

PheonixKingZ

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The only other thing I can think of, is evaporation of hard water. Makes sense that that was the thing in my 20g long, because the lady kept guppies in there before me.

Still doesn’t look like the flaky stuff I had... :dunno:
 

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