Looking for some help please!! I have these spots on my marbled motoros I am concerned about. She is eating great still pretty active. They are in a smaller tank as I am working on a larger tank for them right now. 75 gallon at the moment. I do 30 percent water change every 3 days. I have added a picture of my ph, nitrites, and nitrates. My nitrates might be a little high. I have another female in there as well, but she has no marks whatsoever. I am hoping it might just be a case of the other female nibbling on here.