I keep & breed paradise fish, both the blue/red & black varieties. they are the smallest fish I keep, though they can grow to 4" TL. I like them because they are a ZERO maintenance fish. I have absolutely NOTHING electrical running on their tanks and do water changes once a month. a nice break from the big brusier cichlids who need strong filtration, heat & maintenance every week. of the anabantoids, paradise fish are 1 of the "brusiers", able to dispatch bettas w/little effort.