Just because someone sells fish does not make them a biologist nor a good pond manager. There are lots of fish sellers out there with biased opinions. It is helpful to ask the right questions, however one needs good basic knowledge to ask the best questions. As our mentor B.Lusk always says: You don't know what you don't know and this applied to lots of fish sellers who think they are very knowledge qualified and want to sell you something. If you don't have a good knowledge basis it is hard to ask the best questions. That usually happens to us when going to the medical doctor.
I suggest that what ever opinion/s they have, get a second or third opinion from us on the forum. We are not selling ANYTHING except free very qualified, experienced advice. Then with a few choices and opinions chose what best fits your needs and goals for YOUR pond.
What Ohio town are you close to??