If your anything like me, youll fall in love with bichirs. I started keeping fish because they were so snake like, i have kept a couple snakes over the years and wanted to try something new. You could fit a delhezi bichir, senegal bichir (most common), mokelembembe, and all of the palmas species (beuttokoferri, palmas palmas, polli) for life in that size of a tank. They also deathroll like alligators sometimes, if the food is too big to swallow.
Very cool fish, very ancient, breaths air, sounds right up your alley.
And quite good to keep w/ other fish, as long as they dont suck slime coat or are big enough for the bichirs to eat (alive) ive had incidents where a fish died and my senegal had deathrolled a few chunks but didnt do the actual killing. Ive seen a couple people keep them w/ knife fish
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