This is a question for those experinced with tropheus duboisi... I have recently purchased a juvinele coloney (still dark colored, with spots).... I had to do some work on one of my other tanks, so relocated the fish in there with the duboisi for awhile.... I removed all rock/cave/decor, well the duboisi color of there head became light almost yellowish... Is this do to stress???? Now the fish mates are back in there other home, but some duboisi still havent gotten there head color back... the rock/cave/decor is still not in there because I am doing a deep cleaning, so is this why?