Boesemani rainbow (Melanotaenia boesemani) comes from Melanotaeniidae family. This is a bright, active and schooling fish. It is quite challenging in terms of keeping, therefore it’s not recommended for beginner aquarists.
Archer fish (Toxotidae) belongs to ray-finned fishes of monotypic family Toxotidae, that in order to feed spray water in the air or on the ground to shoot down insects and then eat them.
The droplets hit so hard that insects fall into water, where they are quickly eaten by the fish. It seems that the fish faultlessly knows where its prey falls and goes there fast before other fish gets it or it will be carried away by the water flow.
Besides, archer fish similar to silver arovana can jump out of water to catch its prey, though not very high, just at its body length.
Elephantnose fish or Peters’ elephant-nose fish (Gnathonemus petersii) is a freshwater fish species of Mormyridae family. The fish got its specific name in honor of German zoologist Wilhelm Peters (1815—1883).
It looks quite unusual due to construction of its mouth that is a trunk-like and resembles elephant’s nose. This fish species requires special tank conditions and therefore it’s not recommended for beginner aquarists.
The bumblebee goby (Brachygobius doriae) is a small, bright and peaceful fish which nano tank owners eagerly buy.