Some of it occurs naturally from your tank, like when you scrape that green film algea off of the glass.
DT's phytoplankton is a very popular mix
Kents phyto is also good, but the DT's is live phyto and better for the system.
Thomas
Now, being that feather dusters are filter feeders, i assume they need good circulation. So in turn i would have to buy a powerhead ...is this correct?