My warmnouth in my 55 gallon has been kicking up the gavel in one spot in the tank and then the green sunfish comes over and they turn on their sides flare up their gills and circle around each other. I think they are spawning. Here is a video of a green sunfish building a nest, this is exactly what my warmouth was doing. http://www.youtube.com/watch?v=gvgUQ3BWrKY