I've been leaving my tank to cycle before getting new fishes and I just noticed some spots on my air tube..is it a disease or something? It is like a white/orange colour..and only appears on the air tube and nothing else..=(..i want to get new fish this week but I want to fix this problem first. Thanks anyone! I've attached a photo for a better description of it. I assure you it's not green or brown if it does appear that way in the photo =/..

