I have a couple fairly active ones. One is a SDeT ( previously thought to be HM) who has no problem exploring his 5 gallon territory and occasionally flaring at his neighbor through the divider, and a HM Dumbo boy who's not all that quick, but does seem to enjoy milling around the tank.
The betta that I take care of at work is an older CT who spent most of his life in less-than-perfect care and he, however, is typically quite happy to sit there and guard his bubble nest (that is, until I do a water change and make home build another one - lol it gives him something to do)
Granted, none of my big-finned boys flit around their tanks like my plakat or female bettas, but they do get around
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