I've seen your softie tank in person and as nice as it is it's going to outgrow soon than later, obviously cost are smaller on a small tank but if you are really into it and eventually want a very large tank then I say jump on the chance to do so
and if you sell your eel tank plus anything left over fron the softie tank will help in cost. And I'd say you buy akit of saltceither way lol
makes me wish I had the room for your old softie tank now lol