My dovii spawned before and kept two sets of frys in different containers, Several were kept in a tank with black gravel and another set in large white plastic container without gravel, both were fed the same diet. At one time I needed the plastic container to house something else and decided to put all the dovii fry from 1.5 inch to 2.5 inch in size in the tank with black gravel, what I noticed is that the newcomers were much lighter in color than the older residents in the tank. A couple of days later all the dovii were dark in color. I know fry and juvenile tend to change color to avoid predation, but does the same behavior happen to larger adult fish ?