most common issue with a worm bin is too many food scraps that stay wet as they decompose. worms come to the surface after rain for a reason.
I can grow seeds completely and entirely underwater with enough oxygen, I do it with barley seed all the time for SSTs, yet, unlike hydro, nobodies pumping O2 directly into their soil....
take it or leave it, but too moist for too long or too compact and your soil will kill your worms.
certain chems also have a vast effect....
http://link.springer.com/chapter/10.1007/978-1-4419-0197-2_7
I can grow seeds completely and entirely underwater with enough oxygen, I do it with barley seed all the time for SSTs, yet, unlike hydro, nobodies pumping O2 directly into their soil....
take it or leave it, but too moist for too long or too compact and your soil will kill your worms.
certain chems also have a vast effect....
http://link.springer.com/chapter/10.1007/978-1-4419-0197-2_7