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Are you sure you want Exodons?
My LFS had a big display tank full of them. One by one the biggest Exodon would knock off a smaller one until there was just the big one and a few small really fast ones left.
I'd rather stick my arm in an piranha tank, than an Exodon tank!
Only tankmates for Exodons are Exodons, and a lot of them.
If you do get exodons be sure to post pics. I admire your bravery. Lol.