Meadowlark,
Forgive me if this has been asked before but is there any particular strain of talapia you are using? Does it make a difference for filamentous algae control?
I'd like to try then in conjucntion with grass carp next summer. I'm hoping with grass carp consuming macrophytes and the talpia working on the filamentous algae many of the nutrients may go back into phytoplankton.