It seems that you are talking about the protein skimmer since you mentioned that you added food to the aquarium it does seem that the protein skimmer notice it and well it is removing all the extra proteins from it. Don't worry much you just either need to continue empting out the collection cup or just simply disconnect it for a bit until the food gets totally diluted in the water. Hope this helps and good luck with it just next time tell Matt to give you a phone number just in case something like this happends again.
Fabian
No, it is not new Babe, I\'ve had it for a while!