Yea I really dont know what it is either. I did a 2 gallon water change and I seem to be getting some coraline growth(purple and green). Found another tiny featherduster also. Clean up crew seems to be doing good. Ill try to get better pictures soon. So I think i may have a couple of bubble algae. Check the pictures out and let me know. Im thinking of trying to deprive them of nutrients by getting some cheato and putting it in my tank for now if thats what i really have. If anyone knows of where i can get some cheato please let me know.