Bruce that was my assumption (leaving the LMB in for life). I also assume he will be adding larger BG and LMB over time as replacements.

If there is a 3rd specie with small offspring (FH , tilapia or Tshad) that feed as grazers that should greatly reduce the competition between small LMB and BG for iverts. They also serve as food for both adult BG and LMB with the LMB eating the adult grazers and the BG eating small grazers. Plus all male BG + all female LMB create no small LMB.