gklop, welcome to the site. I don't know much about fish but just wanted to welcome you. I put 8#s of mixed Talapia in my 1/4 acre puddle last yr. and once they reproduced, the FA was drastically reduced. Around mid Sept I trapped a few dozen and had my son overwinter them in his 55 gal aquarium. They've gone from around 2"s to as big as 8"s. I can't wait till the water warms enough ta get em back in the pond. My pond is predator heavy so that probably helped to keep there #s in check. I haven't had any water quality problems at all. If you put some in, you'll be able to monitor their #s as they aren't shy about comin to pellets. If you're worried that the scavengers won't clean em up well enough, come next Sept have some friends over and fish with Stubby Steves or sinking pellets. A long handled spear also works well at feeding time.
