I have 2 ponds, side by side...my koi is 3k gallons and I have 22 koi all over 15", the biopool next to it is 7k gallons. We "rescued" 3 RES last year and everyone has got on well, the turtles will try and compete at feeding time (they go back and forth between the 2 ponds), the koi always win. We got 2 more 1 a RES and the other is unknown (yellow neck, not the red stripe and more yellow in the shell....anyhow, they are all 8-10". They have eaten all my mosquito eaters from the biopool and I've been getting them some "feeder fish", I find whenever we clean out the filter media in the biopool the turtles take off, so I'm guessing it's a food hunt they are going on (yeah, they come back, the neighbor always finds them in her yard). I read what you said about the amount of waste they produce and I'm concerned about what to feed them as obviously I want as little waste as possible as I swim in the biopool. So, what would you recommend? How often? Etc. Weather is hot, I'm in SoCal, we don't really have a winter (just snowflakes)....any advice is appreciated.