Dark Internal Patch In Arowana?

[draconis]

Between the 2 lower fins is a small dark path that looks like it is inside the skin and also the fins directly below look different. It is darker than shown on the picture. Anyone seen this before in arowanas? Should I be concerned? Appreciate the help. Thanks,

 

[WILDER]

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.

Does the patch look black.

 

[draconis]

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.

Does the patch look black.

All the info is in the signature. The parameters as of yesterday are:

PH=8.0
AMONIA=0 ppm
NITRITE=0 ppm
NITRATE=20 ppm

Water is EXTREMELY HARD...

Yes, the path looks rather black. I though it was the anus, but I saw it later pooping from another place. Thanks fo rthe help.

 

[mr130gallon]

you have an oscar and an arowana in a 75 gallon? you do realise arowanas grow to about 4 feet long?

 

[WILDER]

I agree the tanks not big enough.
They need at large tanks over 200 gallons.

Black marks can be ammonia burns that are healing.
But if the mark is beneath the skin not to sure.

Has the oscar been picking on him.

 

[draconis]

you have an oscar and an arowana in a 75 gallon? you do realise arowanas grow to about 4 feet long?

Yes. I'm aware that they may grow up to 36" in the aquarium. But, any feedback on the dark patch? He is otherwise very healthy, swimming, eating, jumping.

 

[draconis]

I agree the tanks not big enough.
They need at large tanks over 200 gallons.

Black marks can be ammonia burns that are healing.
But if the mark is beneath the skin not to sure.

Has the oscar been picking on him.

The oscar will occasionally go after the arowana, but I haven't seen any real damage from those attacks. Is more like he tries to scare the arowana away. If it was a wound inflicted by the Oscar, what would you recommend to help it heal? Melafix? I was afraid that it was internal parasites or some bad infection. By the way, I would like to learn more about the arowana's anatomy, do you know any online sources?

Thanks a lot for the info.

 

[WILDER]

No I don't have any online sites on anatomy.
Try some water changes over the next few days to see if that helps.