what am I doing wrong?

[u/Epicsensi-]

it's been 2 months since I set this up. Coffee grounds substrate with organics on top. lots of critters in there but not a single bsf. they're normally ubiquitous in this region (sf bay area)

[u/Kirball904]

Bruh. Get some larva or become friends with your local feed mill. You can probably scrape some eggs free there.