i have both of them in my tank. X-ray pistella i think is not so nice as compared to balloon pistella. As their eyes look weird to me. But its up to u. I personally feel that cardinal tetra is much easier to keep and cheaper....alot cheaper than pistella. my pistella after sometime has a swimming problem, in the sense that it body keep on tilting up and down as it swims. However, i must say, that balloon pistella are nice fishes.....btw, both species swim in a school....ya, so its like what u wanted, schooling fishes.:>hope it helps.
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