The darters are cool, but they will end up as food if you put them in with the sunfish. You need to choose one way or the other. You can put other NON-sunfish species in with the sunfish but they need to be of similiar size.
Be careful with the crawfish. They are way cool but they have some bad habits. they will sometimes kill and eat your fish, for certain the small fish but sometime large ones as well. Crawfish like to dig. They can mess up plants and substrates. They are also escape artists. Make sure you have a tight lid.
Yankee Dog