Tiny black bugs in soil
Today I was browsing through the wintersown containers that haven't sprouted yet and noticed these itty bitty bugs crawling around. They're extremely small, black with two white spots on either side, and have antennae like beetles, weevils, or aphids. I'd say they are two or three times the size of red spider mites. They are also round and hop when disturbed. I'm not sure if they're eating the seeds or the green algae on top of the soil. They sort of remind me of stink bug nymphs, beetles, or fat, round aphids but much smaller. I tried to take a picture but they're so tiny and blend in to the soil so well that I had to give up.
Any ideas? I think they may be a nymph stage of some bug, but I found it strange that they only appeared in containers that haven't sprouted or those near them.