I have 3 silver dollars in a 40 gallon, and 1 of them is chasing the other 2. I checked the water and nitrates were about 20, so i did a water change, but it is still chasing the others. I have had them for a few months now, and this is the first time i have seen them like this. Is there something that I should be concerned about? The one that is doing all of the chasing, I just noticed has a dark spot on its body, it chases after them, and then rubs against their sides and then goes after the other. What is going on with them? Any ideas?
Sandy
Sandy