My daughter wants (and earned through a reward system) a tank of the glofish tetras. We're thinking of a 20g. I like the aesthetics of the tall best, and it would work best in the space we have. I've always seen these tetras just kind of casually swimming around, not darting around like danios do. So, will they be comfortable and happy in a tall tank or do they need long tank? Another question: Since they're basically the skirt tetras with an added protein gene, would they school together? I would like to have a few white skirt tetras with the glofish.