YP are piscivorous and yes a 8-10" YP can utilize a 2" YP as forage. 3"+ are probably safe from YP. Doesn't mean they will be hammered, but could be. The densest forage type is likely to be utilized as forage primarily - in your case, FHM. Still that's a low stocking density for a 1 acre fishery. Typical stocking rate recommendations are for 250 RES/ac.
Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau