Also, I've narrowed it down to 2 choices, which once I check into cost will more than likely help break the tie

So they are Synodontis multipunctatus and Synodontis lucipinnis. They will be housed w/ 7 mbuna, a red fin shark, and 2 bristlenose plecs. With 3 mbuna to be added later.
So, my question is how many of each would be accecptable in a 55 gal setup?