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What is this stuff?

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This white substance is all over the glass in my guppy tank, but none of the other tanks.  Last week I scraped it all off, did a substantial water change and cleaned the filters.  It has reappeared and blankets the glass. The structure looks to my uneducated eyes like fungus...?   Our water is hard but all tanks are one to several years old so I can't fathom its water related.  

Water tested fine...0 ammonia 0 nitrite 5 nitrate.   The fish are happy, no growth on the fishes or plants.

I'm really baffled.   

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