All that is great info. If you just setup and used prime, then your cycling? If so, turn off skimmer. Like you said, you have nothing to skim. Are you using tap water? Is that what the prime was for? Is this going to be a reef or fish only? I'm sure you know, tap water is problematic for saltwater. But prime does cause an oily film in removal process so that would explain the bubbles.
So, if tank is in cycle, you dont need skimmer. I would use ro
water from now on. Once cycle is complete and cuc is added, then turn on skimmer.