I havent ran a freshwater tank for over 15yrs now and have only had saltwater for the last 3yrs. My question is, I just set up a 2.5gallon tank in my daughters bedroom and presently there are 5 Rumey-nosed Tetras in there. They really dont take up as much space as I thought they would and I was wondering what medium sized fish would do well in a smaller tank like this along with the Tetras I already have. Thanks for all replies!