So it ain't drop eye This wht I read onlineThats not drop eye. I would start treating fo pop eye.
I do water change like 2-3times month Check water it was ok But I will do maybe ever 5days til it get betterCould be your water. I am not arowana expert but I have the same problem with my fronts. The eye almost out from the socket.
I didn't do any treatment but I keep the water clean. I start with cleaning the filter with aquarium water and do water change twice a week.
And it's gone! Mine was a lot worse than the one you showed. I just don't have access to any medication that time. But got lucky.
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C'mon make an effort and do a little research.What is pop eye? What's the effects?