My only worry with Espe's are that they are too hyper active & I have also heard lot of them tell that they are chances of them jumping out the tank when they excited ... I don't like aquarium covered with lids etc.I *love* espeis! I had some, great activity, they really pop under proper lighting, and totally non-aggressive. I figure I'm going to stock my 55 with 2 more schools/shoals of fish (I'm removing the embers, and putting them into my 10) and I'm waffling between espeis, microdevario kubotai, and rummy nose tetras. At the end of the day, it's probably going to depend on if I'm willing to roll the dice on shipping fish, because I know a place that has espeis and rummies in store most of the time, and it's not too far away.