31" long is pretty short. Its a nice high tank its ok for 1 angel or a pair that are getting along nicely. But if they don't get along, there is really no where to go if one gets aggressive or the barbs get nippy. And there isn't a long of room for swimming for schooling fish like the tiger barbs. Watch these fish, sooner or later you will see some action and have to rethink your stocking.
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