Bderick67;4345062; said:How big is your aro, 7.4"? I misread the original post. Are you saying that the fins have looked this way since it was beaten up at 4"? They should have healed a long time ago. Can't see real well but likely it has fin rot. You need to get the water params in order, no ammonia, nitrites, nitrates under 10ppm and a pH below 7.0.
The aro is probably big enough to handle the ray, but I would get the ray out of there as it is adding to poor water conditions.
when my black arowana is at 4" and my orino is 2.5" i didn't notice it will beat up my black arowana.. so the orino bullied my arowana for a one month so i removed the orino for now.. i will joining them when my black aro reach at 12".. its not a fin rot because theres no white color in the fins.. it's still normal just the fins are jagged.. my arowana grows fast.. because he was one month old to me when i got him.. when i first got him is 4".. but one month past i measure him it reach at 7.4"..