Hey guys, When my sister and I were young (around 8), my mom bought us 2 2.5g tanks. I think we kept a betta fish and 2 neon tetra's in each one (I think we were overcrowding them). Now, I have gotten into fish keeping and I have just gotten a 20g, but I have 2(2.5g), which I am thinking about maybe putting some fish in to build up my collection, but what could fit in a 2.5g tank and how many of them. List as many possibilites as possible. So for example 1 betta fish, or 3 neon fish. I will appreciate your help.