Once you add a breeding population of LMB (or BG), you can't go back. LMB will outcompete the SMB (more aggressive, lay more eggs - Dr. Dave WIllis did a study where LMB were introduced to a SMB pond; in 10 years, there were no SMB to be found) and the BG will likely outspawn the YP.

One LMB could be interesting - that's how Aaron Matos got Meanmouths (LMBxSMB).


"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
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