Welcome to the forum. I'd think about starting to take out the RBT as they will usually die if the water gets warmer than 70�F.

The FA in the pond is due to excessive nutrients. With a flow thru system like the pond, unless you can somehow reduce the amounts of nutrients in the creek, I doubt that you'll have much luck reducing the amount of FA.

Check to see if Tilapia are legal to stock in your state. If they are, I'd look at stocking some - they eat FA. Be careful with the water temps. Depending on the species of Tilapia, they might not do well in water temps below the lower 60's.


www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).