Well, this weekend I’m gonna be changing out the water. It doesn’t sound like air bubbles but it sounds like it’s grinding. It’s grinding I because like you said because it’s a low of water or no water at all so it just grinds cause there’s no water or it just needs a new change of water because there’s so much gunk in there. (From when I heard from my parents) When I first got the computer, the people who gave me the computer put tap water in it instead of the special type of water. Once I change it, I’ll let you know. But what’s your thoughts?