Those are diatoms. There's two kinds seen above. There's several shapes they can come in but they will have a silica exterior and are photosynthetic with that brownish look to them.
So back in March I found this strange "thing" from a sample of detritus off the rocks in my sump
Note the clear "feelers" on the bottom there
Just after 3 minutes is also interesting to see what it's doing with those and relating to some things I saw last night.
From the sump detritus play list
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