Down here in Texas the Tilapia are a great success so far. I have said before that ML is the one who got me to try them and I say thanks to him every time I see the results. I have not been thru a winter yet but algae is a done deal and my bluegill are thriving due to the Tilaps taking the pressure off of the BG. It is a lot cheaper than chemicals and any time I can go natural I will. Anyway, I would recommend trying them if you can.