I have a tray of brocolli seedlings at home. A few of them have lots of green things in the soil around the plant. They weren't moving so maybe they were eggs of some kind? I removed those yesterday but loads returned today.
What are they and how do I get rid of them??
They might be grubs eggs that were already in your soil and now hatching? (Difficult to be precise without a photo) You might not be able to get rid them and may have to cut your losses with that batch. If you do - ensure you thoroughly clean the trays with jeyes fluid or something similar.