That could be for starter "big" fish in that size tank not really a good size for grown up "big" fish.
Cichlids can be aggressive, they aren't really my knowledge base. All the aggressive big fish I think of are really too big for a 46G when mature. More like the 100-180G size.
Are you thinking group of fish, singular or pair of fish?
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves