Planted Tank Enthusiast
Join Date: Sep 2014
Location: Minneapolis, MN
How big is your tank?
I think a nano (under 10 gallons) is too small for darters, which are not tiny fish. They need a lot of ground space.
Banded and bluefin killifish could be good options for a nano, as well as Pygmy sunfish.
I wouldn't recommend native minnows or dace for a nano because they are active schoolers that need space to swim.
I currently keep two types of darters, shiners, dace, minnows and one banded killifish.