my new red devil 's color has faded after putting him in my tank with my other devils. all my devils color is like a light salmon color but they where vivid red red at the store before i got them why is this? also would a male and female fight all the time or chase each other. my new devil has a totally different personality from my other 2 they are shy and scared but this new devil is crazy banging the glass i think he is a male his head seems bigger and he is chasing the others all over