I have one fish that changed colour a lot. when i first got him he/she not sure which. was kina dark purplish brown with yellowish fins. Now almost all the time it is the colour in the picture below, sometimes almost white with visiable barring...do you think it is due to stress or is this a normal colour for this fish? I am also not entirely sure what it is....i got mixed answers when i tried to ID it. Also is this one you can tell by looking at colouring if it a male or female?