Do earthworms have any issue with Fossil Shell Flower (diatoms) cutting up their innards?
DE is an indiscriminate killer, it works by mechanical abrasion of exoskeletons. It'll kill friend and foe alike - when dry. Personally, I don't use it for this sole reason. My soil doesn't stay continuously moist by any means... the top layer always begins to dry out before the rest of the medium and since the majority of microbes reside on the top 4" of the soil, it doesn't require much logic to depict whether this would be worth using or not. If you don't find walking on broken glass enjoyable, then neither will your microorganisms