1. What is causing foam to come out of small overflow
hole in top of holding cup of skimmer?
2. It looks to me that the surface of my water is not getting enough circulation. There appears to be a lot of little "thingies"
floating around on top. I have an unused small powerhead...should this be placed just below the surface of the water? I have my larger surge pump at one end of the tank about 1/3 of the way from the top.