I tried to clean my refugium and only find that I think my chaeto is dying...or it's dead already...i don't know what kind of weird purple film is? a type of algae?? will anything eat that? my tank has been running for 13 months and I have daylight bulb shinning on top of the chaeto, still don't know why it doesn't grow...here's a picture of the purple film...my refugium is diry as hell now, main display tank is looking great tho