Fathead minnows usually do not "last" - even though they will breed prolifically in your pond with even a little habitat.
However, if they are given a head start in the pond, they don't last because your SMB will feast on them for months before they get them all! Your SMB will grow very rapidly during that stage.
Does your pond get water from a running creek or a waterway with other people's ponds upstream? If the answer is yes, then you will not have complete control over the fish species in your pond. Some undesirable fish from the grab bag stocking would probably have occurred eventually anyway.
However, if you WILL NOT have fish introduced from the water supply source to your pond, then I would be much more deliberate in the stocking plan. There are lots of posts on Pond Boss from people requesting help to get undesirable fish out of their pond.
We have some posters from upstate New York, so I believe there are some fish suppliers available in that area. Is it illegal (or very difficult/expensive) to get fish into Canada from a U.S. supplier?
Good luck on your pond project. A 2-acre pond outside of Toronto sounds like a great retreat!
