So what do you think I should grow in terms of fish ? I need something I could sell at a profit. Warm water is a prob but I think I could sort that with the system that I've gone for. Because of where I live my cold winters are going to be a prob which is why I like tilipia. They grow quick enough for me to get them in and out before the cold weather. As per my 1st post, I'm trying to sort something out on a commercial basis - don't crucify me for that by the way ! Just trying to make some money out of this which hopefully you won't think is a bad thing.