Do these tetras need a school? I'm trying to figure out stocking for my empty tanks right now. I went to the store and got 2 dozen trumpet snails (yea!) and the last buenos aires tetra in a tank with loaches and black skirts. I know he'll get 4 inches about. I can find some more for a tank, but I think he might be fine with my female bettas and kuhlis in a 20 gallon long. I need something in the middle of that tank because the bettas and loaches like sticking to the sides and top or bottom. I've heard they need a lot of space to motivate them to school and they sometimes fight with their own species. Any thoughts?