minimum quantity on wholesale only

We have two stores in Ultimate v4. Is there a way to set a minimum quantity for a product on only one store?

Store 1 is wholesale and we want wholesale group to only be ably to buy minimum quantity of 5 of any product. The second store is retail and they can buy 1 or more of any product.

In the backend, on the wholesale store, we set the Quantity 5 price in the Quantity Discounts tab. In the front of the store, on a Product Detail page a logged in wholesale customer sees the 5+ price block. But, they can still change the quantity to be less than 5. They would end up buying it at the retail price, but we don't want them to be confused and choose less than the minimum quantity.