Arowana has potential fin rot? Original owner neglected him :(

[Arowanablubber]

I just bought an arowana from my friend who was definitely neglecting the fish's needs. When I moved the fish to my tank the water he had was unbelievably disgusting.
I moved the fish to my clean tank and I'm getting him used to his new home when I noticed some white around his tail fin and a little on his dorsal fin. After closer inspection there are no white dots on his fins but instead just looks like some white coloration. The fins don't look to be rotting away, atleast not yet.

I know fin rot comes from bad conditions so I'm wondering if anyone has any experience with this? PLEASE HELP MY BEAUTIFUL NEW AROWANA.

The specs on my aquarium are all good, 0 ammonia, nitrate levels are all good. since my fish just moved to the tank he hasn't been actively eating yet. (I just got him on 9/22)

 

[Malte81]

I don't see a Problem.
Keep the water clean feed him good food and everything should be all right.

 

[Arowanablubber]

I don't see a Problem.
Keep the water clean feed him good food and everything should be all right.

I wasn’t sure if this was the begging stage of fin rot or not

 

[kno4te]

I don't see a Problem.
Keep the water clean feed him good food and everything should be all right.

+1. Should recover and maybe very early fin rot.

 

[Arowanablubber]

+1. Should recover and maybe very early fin rot.

I woke up this morning to my fishes fins looking like the have ripped or been cut. No other fish in the tank tho. What do you think is happening?

 

[islandguy11]

As stated above (and in your other post on same subject in Arowana sub-forum), this is most likely the beginning stages of fin rot -- and comparing your first and last pix it's clear that it's gotten worse.

Some advise Melafix for fin rot, some just recommend lots of water changes.

You say your nitrates levels are all good -- I'd be curious to know what is the number after you test the water.

Also how many inches is your Aro and what are dimensions of your tank -- I can't tell for sure but it looks kinda cramped in there, which can lead to stress and then immune system goes down, which leads to other issues.

We need more info to help you better buddy, if it is fin rot it should be addressed asap, it can start moving fast, resulting in serious if not fatal consequences.