Help ID worm-like creature in bioactive

Can anyone identify these worm-like bugs that are in this bioactive setup? And are they beneficial or parasitic? (The things that almost look like tiny bean sprouts)

u/Chthonic-Dog — 8 days ago
▲ 18 r/boneidentification+1 crossposts

Weird jaw found at in New Jersey

My friend found this at the beach in New Jersey. Can someone please help ID!

u/Chthonic-Dog — 2 months ago
▲ 61 r/namemypet+1 crossposts

Please help haha I've had him for two months and no names are sticking! He's a het anery longicauda:)

u/Chthonic-Dog — 5 months ago