Some of my bass do not eat market shrimp. Silversides, frozen or FD Krill are usually the ticket for that size bass. I am assuming you caught him where you catch LMB he is accustomed to the LMB's so give him some time. You could try worms too. he will come around when his stomach tells him to. Comparably, I would also have to say release your LMB, just because they are not Cichla baby.......Also, not that you have a lot of them down there, dont mix Smallmouth with cichla they are definately meaner than any Pbass.