Does anyone have any experience as to what it means when the EBJD turns really dark blue, almost black and also when it turns into a more turquoise blue? My one is very dark a lot of the time but doesn't seem stressed, eats well etc. However he is a lighter blue, like a purply turquoise in the mornings but gradually gets blacker as the day goes on, and also I noticed when I did a water change earlier he changed into a turquoise colour when I was pouring some cold water in. I think he looks better the turquoise colour. My temp is at 28ºC and has been since I got him. Do you think I should turn down the temp a bit or is the lighter colour when he is stressed? It is very confusing!