Here in Indiana to use Tilapia successfully we have to do two things. 1) kill any FA within a few days of stocking the tilapia, either pre or post stocking. 2) We have to stock 40# per surface acre or it's like we never put them in.
If we don't stock roughly 50% female, 50% male the FA control isn't as good.
We typically stock 5"-9" fish.
In regards to you applying the algaecide, how much are you applying, how are you mixing it and how big of an area are you applying it on?
Plus, what time of the day are you spraying the FA?
| 
