I've had my arowana for about 6-8 months. It was only about 4 inches when I bought him and he had artificial blue color from uncle bills. I noticed his spine curving not longer after we bought him but I can't find anything online to explain it. I saw plenty of pictures on google with arowana having their spine bowing upwards but not dipping down like mine. Could he just be deformed? Or could it have been the artificial color? Please help!