I would also stock GSH. I am betting your FHM will be gone within a year or two. That will only leave you YP as your major forage. If you keep your SMB numbers reasonable and don't over stock your walleye, I think you can maintain a permanent GSH population. Particularly if you stock some more advanced sized adult fish. If no GSH are present, unless your YP and SMB are pellet trained I think you may have some forage base issues.