It is essential in my opinion to keep some semblance of balance.

One thing that can happen (which can be good or bad depending on the goal) is that LMB will stop reproducing if extreme overcrowding of BG occurs. LMB can sense that reproduction efforts will be fruitless and abandon the event until the situation corrects.

Also extreme overcrowding of any species leads to poor population conditions subject to disease and starvation. This leads to wild swings of all effected populations.