I'm no expert (but I'm sure one will address this shortly), but, I see some problems. The Venustus can get up to 12 inches in length and is a predator; it will terrorize the tank eventually. If your Jewels and Convicts are male and female they will stake out territory and at least attempt to bred and beat up anything that gets near their area. Green Terrors are called Green Terrors for a reason, but the Mbuna will pick on it. The Peacocks will probably get picked on by everything but the Rainbows, but the rainbows probably won't last long once the others begin to reach maturity and get aggressive. Truthfully, I would slap who ever sold you that combination of fish.