I have a protein skimmer that is taking waste out of my aquarium, but not only is waste in the collection cup, but its also collecting on the inside of the skimmers neck making a thick sludge, is that supposed to happen? My tank is a heavy bioload system that has a porcupine puffer, snowflake eel, melanurus wrasse, blue hippo tang and clownfish (one of each). If the skimmer is being overloaded does it mean I have to upgrade?