Hello,I have been keeping 3 silver dollars for about a year now,they look great (about 4 inches across).I believe that I have one male(bright red anal fin) and two females(plain anal fin).For about a month now the 2 females have been chasing each other around day and night,every couple of minutes they stop and lay their bodies flat together and start wriggling like mad,then they start chasing around again.The male just stays at one end of the tank out of the way.What are these two crazy females doing

Is this a prelude to breeding?Are they trying to attract the male(like a sort of rutting for fish).Or have i just got lesbian silver dollars lol .Any ideas anyone,thanks.Andy