when the system is running the tubes are cloudy (im using str8 water) and i know its from the high flowrate, no big. If i unplug the pump and let it sit for say, 3 minutes, when i come back theres a very thin layer of green foam at the top of the res. I expect foam, is it green because of the inside of the heatercore? Everything is brand new so i assume its just crap that will go away after i finish leak testing and change the fluids.