I've had my 4 silver dollars for about 5 months (2 males, 2 females) and they seem to be doing well. I know I should have 2 more, but made the rookie mistake of not researching them before buying and don't think my 65g can handle 2 more piggies. On to the question, I've noticed that the males will get black marks on their fins, show orange near their gills, and their spots will darken. Thanks to Google, I've learned that this is mating behavior. My question is how often do silver dollars normally do this? Over the past few weeks my males seem to be 'showing off' all of the time. It seems like every time I check on them their fins are black. They tend to pester 1 of the females more than the other. Just curious if the frequency is normal or if it will taper off after a while?