Be concerned? Good reason to be. I personally wouldn’t add the cats at this time. I prefer to give the minnows and sunfish a year to populate the pond. You can add the bass and cats simultaneously.

My answer re predator stocking. When a bass can go to sleep with its mouth open and wake up with a full belly, it’s time to stock. The minnows will disappear in about a year from predation. That’s ok. They are used to jump start the predators. The forage base is the bluegills and bass minnows that are spawned.