Echo what I said in your other thread about completely killing off the upper pond. Put in your stocking plan for the new pond, FHM, SFS, BNM, RES, then YP and SMB. I'd wait until the SMB have some size on them before introducing water from the upper pond. And check and triple check that no LMB or BG remain. Along with the the additional water source, you could definitely use it as a feeder pond for additional forage, or as you're considering, more YP and RES. Especially if you're able to control what goes in and what doesn't. That'd be a pretty cool. Fun project man.
Oh, do a lot of research on crappie in small ponds. It's generally discouraged.
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