Whats this red stringy thing in substrate?

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Barskeeey

Barskeeey

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2 months ago I saw this in my substrate (2nd image), I thought I siphoned it out but today I saw it again in the same spot.

What is it and what should I do with it?

IMG_20260207_115642127_HDR.jpg IMG_20251225_131905755_HDR.jpg
 
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