Stumped by mystery layer in fermented...

[rhymeswithoranj]

Second ever BIAB brew. It's a NEIPA - roughly 70% Maris/Pilsner, 20 wheat malt, 10 oats. Minor variation on a version I've made several times as a partial mash. This image was shot maybe 12 hours after pitching. It's faint, but you can see what looks like a 4-5" floating band of... trub? something? I have no idea. Any clues, knowledgeable guys and gals?

 

[Barry]

Second ever BIAB brew. It's a NEIPA - roughly 70% Maris/Pilsner, 20 wheat malt, 10 oats. Minor variation on a version I've made several times as a partial mash. This image was shot maybe 12 hours after pitching. It's faint, but you can see what looks like a 4-5" floating band of... trub? something? I have no idea. Any clues, knowledgeable guys and gals?

My guess would be true, still settling. Did it settle with time?