If the minnows were 250-300 minnows/pound they were tiny and wont last long since you are only talking 3,000 minnows. I concur with the stocking. The biggest question is how many other bass and size are in the pond since they will be hitting these minnows too. I would have suggested to add more minnows and have done an electro-fishing survey first in order to see what you already had in the pond THEN determine what would be best to stock. I have had the ODWC crew come to a pond or lake and assisted them with the survey THEN determine what was best. Good preliminary data yields good results.
So what was dumped in the pond in October and where did they get it?