What plants are you thinking about implementing? How much open space do you think there will be once its fully grown in? That may help you narrow down your choices for fish.
I haven't really put much thought into it, was looking for suggestions. In my 90g I have swords, and jungle vals, so something possible easy to grow to start off....
I really like congo tetras but may be too large for this tank. Rummynose tetras school well also.
I have 6 congos in my 90g, and I love them, I'd think they would need more swim space though, the 37g is only 30" and the 90g is 48" so that extra space I think they really enjoy....
If I did only congos, how many? 7-8?