Do they look like this? If they do they're called thrips. Bad assed little suckers. Can ruin an entire grow if not addressed. I had them and used a product called Concern. It's an insecticidal soap. You spray it on. They're less than 1/16" in length in their larval stage. If they get into the foliage of the plant you'll see newer growth with little yellow spots on them. When you look close you'll see some black spots also which is their crap. Here's another pic of what the leaves might look like or worse if they've gone to town on 'em.