I have been scraping a lot of algae off the tank glass recently and just noticed that I have also got algae growing inside the clear 5/8" diameter hose going from the tank to the cabinet below and the hose going into the tank from same cabinet. This growth is supported by room flourescents maybe 12 hours per day. Is this something that will get worse and maybe restrict flow or will it also disappear as my nutrients balance out better or will it just be a visual problem only? Do you have this too?