Ive been raising extra small bsfl for a while now. They are getting quite large but not moving much. Their bed is coffee grounds and fruit/vegetable pieces. I failed to ever put in ramps but now im seeing beige tiny worm like things under all the veggie pieces. Im not sure what they are, I guess Im hoping they are new born bsfl but not sure.
You'll know soon as you begin to see a writhing mass of larvae consuming food. They like darkness. The first time I saw larvae was at night when I took the top off of my composter and shined a light inside - The larvae were on the surface. There has been no activity in my Bio Pod this year but I expect it anytime and look forward to production ramping up. Good luck.