Is there a large failure rate with australian rainbows? I never see anyone recommend them.
I tried tiger barbs twice. Each night one would get picked off. The same happened with giant danios. Wait till they go on sale for a $1 at either Petsmart or Pet Supplies Plus, if there's even one by you. I do love the way tiger barbs look though.
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Filament barbs: bigger than giant danios, nowhere near as big as tinfoils. Mine are about 6". They aren't supposed to grow anymore.
Someday I want to do a Barb-only tank: Tigers, Filaments, Spanner barbs, Tinfoils. That would be lively. Essential link on barbs: http://www.seriouslyfish.com/group/barbs-relatives/