Hello,
I too have tiny white dots, but they are more noticable on the gray inlet tube and black cover for my circulating pump. There are some white specs on the corner of the glass near the inlet tube on the silicone area.
I had assumed that they were some form on excrement from the snails or urchin that I have as they are always hanging out in that area.
I have not looked closely to see if they have any 'snowflake' like attributes, but will do so right away, ( I need a magnifying glass, as I cant see that close.
Bill