I reckon the first one is the larval stage of a non-biting midge(A bloodworm is one), seeing as they live in tubey things (for need of a word :-? lol) eat sludge, rotting vegitation, soil and sewage
they will turn into pupa eventually so you could try sticking some of the muck into a icecream container,ect and then see if you get any midges
I dunno about the 2nd one though...