my xback is kinda layed back, it has a snap every now and then but thats it.
it was just a try it and see type of thing i never did anything special just put them in at the same time.
i did have a 8" black/blue aro inthere as well which was also happy swimming around with the xback and the silver but the xback snapped at that one day so i removed it as the black/blue cost me £160.
the tank is 8x4x2 and its 400 uk gallon, it also has a 5ft sump tank and a 4ft overhead tank so its more like a 450 ukgal system.
thanks for all the comments here is a little video as videos show the colour better