Schooling behavior tends to fade after a time in small tanks anyway, so don't worry about the bubbler. If you really want to maintain schooling behavior, then you'll need a bigger tank. The area of a ten gallon tank is really very small when you think about it, and fish scattered all over the tank can still consider themselves schooled. Think about that same area in an open river or pond. A cluster of fish that size would be considered tightly schooled, right?
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