So if you zoom in towards the top of the res if you zoom in you should be able to see these black specks and marks. Not sure what these are i made sure to clean the rads and use SysPrep for 20 Hours. Fluid is Mayhems Pastel, I dont have any mixed metals. These marks and dots did not go away when the pump was on and working. Also those spots on the side i believe is just water.