One of my dream fish in a hardwater african set up.
Here's a good profile:
Gnathonemus petersii (Elephantnose Fish) — Seriously Fish
55 gallons would be a tight squeeze, especially with other fish. If it's a really long/wide tank as opposed to high, that would be helpful. And more than one would be a no go.
Though it says they are unfussy I remember a member on another forum having loads of trouble feeding theirs. The poor fish went quite a without eating and faster fish were eating all it's food. I'm guessing this fish is usually wild caught and therefore a frozen/live diet is best. Also those mouths are adapted to eating things like small worms, not flakes.
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