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That's my thought.long stringy stuff.. maybe Dino's? Seems to fit your description of it coming back every morning.
MattG you could collect it and do the coffee filter test. dino filter testThat's my thought.
I would siphon out the strands and try the dino filter test and if you have access to a microscope have a look. Looks like a new tank cycling? You could try a few days of blackening out the tank. Do existing strands disperse at night and vanish by morning?No bubbles in it. When i stir up the sand bed, alot of it appears to be clear. Makes my tank look like its full of spider webs.
Looks like new tank uglies to me.

