I'm no expert, but I've been working on the balancing of species in my pond since building it three years ago. Based on the small size of the 1/3 acre pond, I doubt you will ever sustain allot of larger/ preditor fish in there. I would recommend using it as in incubator for minnows and smaller fish you want to protect. That way you can use the bigger pond for the lunkers and keep them from eating everything, which has been a problem for me.
As far as the connector pipe, that may be good for the water flow/quality depending on where the source(s) and discharges are.
I have about 1/2 acre pond in western PA w/ spring feed. I'm trying to balance golden shiners, perch, and LM bass.
