Juvenile polychaete in sump detritus?

[squidzilla]

Hi all, siphoned my Biocube sump out (what a mess! Can't believe I left so much decaying organic matter in my tank for weeks and weeks) and noticed a dozen or so of these critters shooting about the muck. There were some 1" bristle worms--are these the larval/juvenile form? Size is about 5-6mm.

P.S. does anyone have any detritus eaters confined to the sump of their AIO tank?

 

[Grapefruit509]

Pretty sure amphipods

 

[Sk4peep]

amphipods leave them in your fish will eat them they’ll feed off of decaying organic matter

 

[NoahLikesFish]

amphipods leave them in your fish will eat them they’ll feed off of decaying organic matter

skapeep i love your boxfish