You should not have a problem with forage for LMB right now. It is 2-3 years down the road that a problem might arise. With that many PS the BG may not spawn successfully this summer. I would look to adding adult BG early next spring. You could add adult BG now but they may not spawn this summer. Both BG and PS are known to stunt and cross. I would not suggest stocking yoy 2inch LMB into a pond with that many PS and RT. Look for some 6 inch LMB this fall (early) but no more than 10 per acre to start.