Bill thanks for the comments and I agree with them and am stressing the "BALANCE" part of them. BTW the pond AATW is talking about has no LMB. The LMB are in his other pond.

AATW I would do what Bill has described. I would not put the LMB in , if at all, for a couple years. I think you can work through this without them and have a nice SMB/YP/BG/RES pond . You may need to add some FH yearly and work on keeping it in balance but that should be doable.