Look at the bugs again? Head (structure of mouth pliers) and abdominal structure (see if there are any legs, walking posture, etc.). ) are compared with fly maggots.
The picture I sent is the second alien in the breeding process of fly maggots. The first is fleshy spikes. This kind of spike is long and looks a bit like hair. Your worm head is a bit like mine. Different colors may be due to the environment. Your flower soil is black, and my breeding feed is yellow.
What I said may not be right, but it can provide a direction. If it is a fly maggot, a fly maggot expert should be able to give an answer soon.