Identify. Diatoms or brown algae

chicago

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Please help. see attached . I have this same looking growth on all my rocks. Thanks

99CE520A-99FA-4850-A64E-4D5F16401260.jpeg
 
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chicago

chicago

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Here are actual pics of the growth I am
Looking to identify. Natural sunlight off the sonde. shows it nicely. It is not drowsy due to the sun. Only hits tank for a half hour in mid simmmer. But sure looks nice back to the id. Need some help. See attached.

AD9D3F4A-C9F0-471D-BE54-3C8FD7F6E3F5.png
 
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chicago

chicago

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Another pic
 

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taricha

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is it firmly attached to the rock (GHA)? Or does is blow off in sheets (cyano)?
Weird color combos are often some tiny organism growing attached as epiphytes to GHA.
(those are my first thoughts.)
 

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