PO,
The general recommendation is 150 to 200lb per surface acre. The idea is to achieve a balance between bacteria and food sources so that you don't have to repeat the treatment every year.
I treated with cornmeal two years ago and have not had to retreat yet. Here in north Texas the filamentous algea is my biggest problem as well.
Good point about the fish. Do you have to replace the fish? How much work is it to maintain non native varieties? It sounds like from the other posts that Tilapia is the one to choose.
Thanks,
JW
