I purchased a new reef octo classic 150 int skimmer today used off of fb marketplace. I have a few questions regarding it. Firstly is there a break in period for used skimmers or is that only for new ones. Second, how do I tell when my skimmer is running properly. Should the foam be mostly sitting on top of the neck and not pouring over much or should I have a constant stream of foam slowly draining into the cup…. OR should the foam be below the opening in the neck and work its way up over the course of a few hours. I think I understand the idea of having bubbles that doesn’t raise high enough and having to much air that the bubbles don’t collect but I am just slightly confused on how I tell when it’s operating optimal.