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At first I thought it was a crack lol, then I read your post.It sticks to the glass, but not very hard (easily wiped away with a sponge). It looks like it's a bunch of small stick like growths all pikes together to make it.
I'll see if I can listen up the picture
So far I just reminded from the tank using a sponge, and it came back a little. Once I reminded the second time, it has stayed gone!Its a form of dinoflagellates. . . Not the type that wipes out your tank potentially. Simply blow loose with a turkey baster and scoop it up with a net and discard. Reduce white light intensity and you can even add 1ml of hydrogen peroxide at night for 7 nights to help alleviate it