My Boesemani do exactly the same thing: I think it's a kind of courtship as usually is the male that does it with one of the females.
Boesemani share the tank with a male betta and an epalzeorhynchus siamensis and actually the one who dominates is the betta: the boesemani are quite submitted...
just discovered this forum: it will take me ages to read everything, but it already looks absolutely interesting! I'm so interested even in compare experience (mine is quite poor actually! :blush: ) with people from a different country.
P.s. Sorry for my English... hope you'll understand me...