Calculate the relative weight of your LMB. Then you will have an idea where you stand. Fatheads will last about 3 minutes in a pond with bass. Even if you were to raise them behind a blocking net and released 200 pounds of FHM, they'd still be gone in a few days. GSH would be a far better option. You can add PK shrimp, especially if you have the right habitat for them. In the end you need to remove bass in all likelihood.