I have an elephant nose, I've had him for 2 years. These guy's aren't easy to keep, mine has his tank (53 gallon) all to himself he won't tolerate any tankmates he just kept attacking them, i even had more elephant's with him but that didn't work. They require sand substrate, a pipe too hide in, mine is fed live bait bloodworm and brine shrimp when the lights go out, in the morning i get up early and feed him frozen bait giving him a few hours before the lights go on. I pwc every 5 days too keep his water pristine. He's 8 inches and 4 inch depth so yeah they get big! He also likes live plants and usually sleeps in them, he's playful as well Lol hope some of this helps.
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