Had four 3" greenies and an orangespotted sunfish in a long 20.....every sunfish has been killed by that green sunfish. I read up that redbreast's dispositon is similar to the green sunfish...aggressive as heck.Yeah - just going ahead and saying redbreast and pseed in a 29 is going to last a few months at best. They don't even have to be full grown, once they hit about 4 inches all hell is gonna break loose.