I know nothing about these fish but have done a quick search (and they do look nice so I can understand the attraction!) Not sure if this info will help but ...
"The Elephant Nose is often seen for sale, and purchased due to its unusual appearance and activity. This fish however, is not for beginners, and should not be purchased unless you know exactly how to keep the fish properly.
An interesting feature of these fish is their possession of electroreceptors covering the head, dorsal, and ventral areas. The fish uses electrical discharges to find food, communicate with other fish of a similar type, and for breeding purposes. Elephant Nose's are also excellent hearers, and are very sensitive to noise and vibrations.
The fish are naturally nocturnal, and requires dark hiding spots in the aquarium. Because of their very sensitive 'noses', it is vital that the aquarium contains only a sandy bottom, since gravel substrates will damage the fish, leading to infections. Elephantnoses are best kept as individuals or in groups of 5 or more. It is not wise to keep pairs or smaller groups, as the fish are likely to bully weaker individuals.
Given the fishes demanding requirements, and because they are nocturnal, the initial 'novelty factor' will wear off, we would suggest that the fish is avoided for home aquariums."
Maybe he/she is lonely? Is it noisy is your house and that is upsetting him/her? Good luck
