The white looks like a filter feeder sponge. There is no such thing as a "clean" environment. Where are you putting the cheato? If it is in a sump, don't worry about it...get some peppermint shrimp to keep the main tank clear of it. I don't recommend to put cheato in the main tank, it does break apart into little bits if it goes sexual, and it gets in everything and clogs all the pumps up. I have lots of macros, but I swore off cheato going into my tank ever again.