About a month ago I had e-mailed ML and had commented that since I had stocked the Tilpia in the early spring evry time I throw the cast net now that I see many more BG of various sizes. So for what it is worth I see the big improvement in BG production or survival. And all the algae and chara are gone. This was the first year that I have tried the Tilapia. Very satisfied so far. Thanks again ML. Spent approx. $200 on three tanks (ponds).