This happened to me when my tank was just started as well, now that I am a couple of months in (and have added some fish), I cannot seem to find any. I don't see them on the glass anymore, and careful inspection of the rocks at night I still cannot seem to find any.
Is the decline of the copepod population an indicator of anything?
Their definitely copeods coppers and I see them floating about untill until they land on the glass. That's how I know it's them floating about. I've got filter wool in so hopefully they will go on their own.
They are making my water look dirty.