What about chosing from these? You're already doing the leleupi, so chose one or two more
• Julidochromis regani - 1 pair
• Neolamprologus leleupi - 1 pair
• 'Lamprologus' occelatus - 1 trio
OR
• Telmatocrhomis vittatus - 1 pair
• Lepidiolamprologus hecqui - 1 pair
• Synodontis petricola - 3
OR
You could aim to have two pairs of fish. Your choice: (Works for 29gal also)
• Julidochromis regani - 1 pair
• Neolamprologus leleupi - 1 pair
• 'Lamprologus occelatus- 1 trio
personally, I'd add a juli and a synodontis...if you can get a syno. lucipinnis they only get to 4" max.