don't know about tankmates. Do a search here on MFK. They've been discussed a great deal. I can't sell them, but I know of a HUGE supply of them that I could help you aquire. The water is green with bowfin. There's litterally so many that you can't see the bottom of the river. They're stuck there because of a dam. Pretty fun to catch. I've caught them in the 27-28 inch range. They're REALLY cool looking fish. the pics don't do them justice.