I haven't kept a smooth hound shark nut I have kept leopard sharks, Triakis semifasciata, back in the 90's when babies were legal. It was really a sad experience and I'm glad they are no longer legal. Most either jumped or died when they grabbed something they couldn't swallow or would wedge them selves into rock chasing something. Basicely in all three scenarios they'd suffocate. If they learned what they could and could not eat they'd have voracious appetites and would grow pretty fast, several the first year and couple inches a year afterwards. Keep in mind body mass is doubling pretty fast, it's not just a length issue.
Just dong a quick look online even for a baby you really need a round tank of several times more volume than you're thinking of. It needs to be pretty much free of any aquascaping so maximize swimming space. You also need to plan on a lot of filtration and water changes to deal with all the waste and unless you're feeding exclusivly live foods, the phosphates seafood is preserved with.