I added a couple of younger spotted silver dollars a few weeks ago. These guys are less skittish than my older two, and chase each other all over the tank. No fun nipping, it's almost like a mating ritual, but I have no experience with this species' mating behaviors. Their anal fins turn black, and they get orange spots behind the gill plates as well as on their pectoral fins. I've never seen the orangish display on any silver dollars before. Has anyone else? Not concerned, just curious.
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