butterflyfish

Pantodon buchholzi (Freshwater Butterflyfish)

The Freshwater Butterflyfish is very peaceful but predatory. It will eat all small fishes. It grows into a maximum size of 10 cm (4 inches). It needs to be in large tanks with alot of floating plants. The bottom part of the tank you can decorate how ever you want.
You can keep it with other calm and peaceful species as long as they are not too small.

Longnose Butterflyfish | ©Beat Korner

Forcipiger flavissimus (Perciformes - Chaetodontidae), also known as Longnose butterflyfish or Forcepsfish, inhabits rock and coral reefs from East Africa to the America; the SW Gulf of California; the Revillagigedos, Galapagos, Clipperton and Malpelo islands. It is the most widely distributed of all butterflyfishes.

This fish can usually be found swimming alone or in small groups of up to five fish. Once an adult butterflyfish finds its mate it pairs up for life. When it is time to have babies, butterflyfish gather in large groups, and their eggs are carried away by the ocean current, floating near the surface before they hatch. The new hatchlings live in a layer of plankton for about 2 months, during which time they are almost as well-protected as their parents, with a spiky armor covering their bodies. When they are big enough, they swim by night to a reef, where they will live for the rest of their lives.

[Source]