That wont work IMO. Why you may ask well Your LMB will start to out grow your BG, fairly quick and LMB will try to eat stuff 1/3 their length so a 6 inch LMB will try to eat a 2 inch BG, you would end up with no BG or minnows or anything left. You got to give them a head start...

The only difference between a rut and a Grave is the depth. So get up get out of that rut and get moving!! Time to work!!