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Greetings. I am new to this group and hope to find out an answer to this question. I have 2 big silver dollars, about 6 inches, who are constantly chasing and bumping into each other, to the point they are both finless and have indentations all over their bodies from fighting. They are in a 75 gallon tank with 8 tetras, 3 pictus catfish, 4 cory cats, and 6 upsidedown cats and one pleco. Do I need to add more silver dollars to keep them from fighting each other? I did have three silver dollars and they were all three chasing each other constantly, so I brought one to my pet store. But these two are still chasing and nipping at each other. They also don't eat much, that I can see. I put small algae wafers in the tank, they sometimes catch them, then spit them back out again and go on their way. I just can't decide what to do........get rid of one more and only have one left. Or buy more to keep them from fighting each other all the time??? Any help would be most appreciated.