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Schooling of closely related species...


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Good morning all!

Curious question regarding the schooling of fish...  My tank is currently stocked with neon tetras.  Given my nitrates are almost always rock-bottom, I figured it could likely sustain a few more fish.  I want to add some color and variety, but don't want to go overboard.  If I purchased another species of tetra, would I need another 6-10 to form their own school, or would the presence of the pre-existing neons be enough to fulfill they need?  I wouldn't just purchase 1 or 2, but likely 4 or 5.  Thank you in advance to all you big brains out there!


Edited by Martin
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