Stingray biting aro?

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Are you talking about just the torn tail? Not a ray doing that at all,
 
Looks like pretty rounded bite marks, so I'm assuming it was the leo. He is also new to the tank and there was no signs of aggression between any of the other fish before hand
 
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They may not be showing aggression with you standing there. Once you leave or once the lights are off is very likely to be when the fighting is taking place. I have had fish fight only when I'm not in the room but when you sit in the room they act completely fine.


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Well I've got the big ray separated in the tank, so we will see if the aro improves or if there is more visible damage. The aros have been together for almost a year and there has been no problems. I know that can change, but the silver aro also has a good 12" on the asian.
 
Well I've got the big ray separated in the tank, so we will see if the aro improves or if there is more visible damage. The aros have been together for almost a year and there has been no problems. I know that can change, but the silver aro also has a good 12" on the asian.

The size of the aro means nothing
The Asian aro will beat the silver up at some point

With multi aros even just adding one new fish is enough to mess up the harmony

Everyone is telling you it was the aro it sounds like you are trying to convince your sell it was the Ray


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Nope I am not, I'm just considering all possibilities. I've already separated the leo, so I will wait and see what happens. There's not much else I can do right now besides that at this moment.

PS. I don't need someone telling me what I think. No offense, but you have no idea the individual personality of my fish. Yea you can say asian arowanas are typically an aggressive species and that it is most likely the asian that is attacking the silver, but you can't honestly be 100% sure that that is the case.

That being said, I appreciate the advice and I will try to watch how the asian is behaving from afar. (maybe I will notice different behaviour if it doesn't see me-like mentioned earlier).
 
Were just trying to help here, allot of people with allot of experience with your same fish types over many years of experience, How big is your tank? I ask just because arowana are space hogs and picky when it comes to changes in space, the divider might make it worse, and people are a little anti ray attacking just because rays don't attack unless they are hungry usually, at least ive never seen different, and when they do its not for fins at all, as stated before they go for the gills and head, they are very smart, the markings on your fish is very much other fish like at the tail like get out of my space chase away and nip, rays don't have any reason to chase away a fish from the space as they own the tank or will get stressed and die being chased by others.
 
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