marbled motoros

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...

Here are some pictures of my 2 female marbled motoros. They were born 9/17/2015.