Aphids. Those clones look kinda bad, separate them now to ensure they don't spread. Should be treatable but you may want to ditch the infested ones to be safe and focus on the rest, depending on your situation/space. Your early in veg so they should be able to be saved. Gentle spray/scrape off whatever bugs you can see. Your safe to use pesticides or insecticidal soap etc if you're ok with that, or there's organic/natural solutions like neem oil or pepper sprays that I think might work as well.