It looks like the skimmers doing what it's supposed to do and now it's just a matter of eliminating whatever is in the water that's causing such a huge foam output, I'd reccommend using chemipure to see if that helps. Although it no longer appears that anything is clogged, Just for info purposes, my rs135 when I first got it would run fine for a few days then tank water would just start pouring out of the top, I disassembled and cleaned the pump and washed out the air hose with freshwater, that is supposed to work but didn't. After closely inspecting every little part, I discovered some soft white stuff that was slightly covering the actual valve, the part that the handle opens and closes. Cleaned it off and it's been fine since. Just a little added info in case it's ever needed.
Hope that helps.