Here is the species profile, in case you hadn't checked it out yet. I think you can only do groups of these guys in
very large tanks. IMO, they are really cool fish, but they need quite particular tank environments to be kept happy, plus they aren't cheap to buy, so you really want to do things right if you plan to have one of these guys. Also keep in mind the live food issue, not a big deal, but it is not as cheap and easy as buying some flakes, or snatching the occasional vegetable from moms salad
Elephantnose
AKA: Peter's Elephantnose
Gnathonemus petersii (Gunther, 1862)
Temperment Sociability Min. Tank Availability Area
Beware Solitary 45 gallons Common Bottom-Middle
The Elephantnose is native to the warm freshwaters of tropical Africa. These fish are not bred commercially, but are imported for sale. Though they can be expensive, their oddity makes them of interest.
This fish possesses and electrical organ. They have electricity-generating cells that radiate a magnetic field around the fish, which assists navigation in the darkness.
House this oddity in a large tank with plants for shelter. The Elephantnose is nocturnal, and so it should be provided with dark areas where it can hide. Because of its shy, delicate nature and its occasional aggressive behavior, be aware when introducing the Elephantnose into a community aquarium. These fish burrow and need a soft, sandy bottom. One Elephantnose is recommended per tank as it becomes aggressive towards its own kind.
Gnathonemus petersii can be a playful fish. With its surprisingly flexible long nose, it will dig and feel around in search of food. It generally ignores prepared dry foods, hence live foods must be available to the owner. Because of its small mouth, the Elephantnose can only swallow small bits.
Provide this oddball fish with a water pH around 6.6-7.4 and a temperature range between 72-82 degrees F.
It is said that sexing can be done by observing the anal fin; the fish with the more curved end to the anal fin is the male. Breeding in captivity has not been successful.