just bought a euro-reef es6-1. If you are asking if there should be bubbles in the main column of the skimmer the answer would be ,yes. The bubbles are created in the intake of the pump and chopped up smaller in the "special impeller". The peice of foam you are refering to goes around the exit pipe to decrease bubbles in the tank. i had to add an extra baffles to my sump to stop the microbubbles (for the most part at least) it took mine about 6 days to start working and now it's nuts, atleast 5 times more effecient than my bak pak. I hope that answered your question. I couldn't quite understand what you ment by "pump intake." make sure your water level is good to. That skimmer needs to be in 6-8 inches of water, and the pump comes with the skimmer. There is no way it is too fast for it.