i have read alot of threads regarding the arowana backgrounds. some people suggest using a darker background to reduce arowana aggression and some people suggested not using a background at all. all of them had their views. but i really want to go ahead and experiment with the dark as well as no background. my aro tank was without any background for the past week and the aros have been fighting and going after each other. yesterday night i decided to put in some background. so i put a pink colored cloth. and bingo the fighting stoppd totally and infact they are swimming together.side by side. so what i think is that its not the light or dark background but maybe the change in background makes them feel that they are in a new environment and they stop fighting over territorial issues. so changing the BG every couple of months would actually help in stopping them from fighting. what do you guys think??