RTG with expose gill - Need advise!!!

[stoner]

Hi Guys…

I recently got my self a 5inch RTG, whose left gill is exposed. As it been living in very unhealthy water conditions when I first saw it, in a 1ft tank with small an air driven filter.

As the owner got it/brought it in a batch… there was no way to determine whether it is a birth defect or an injury…

I know that there are many people who not take in an Arowana in such condition. Some even would say that it's a waste of money just to feed it… (No flames… please…) But I got it anyway , hoping that with lots of tender loving care and prayer… I could get the affected gill to “Close-Up”.

It’s my very first Arowana and it’s currently house in a 2ft x 1ft x 1ft tank. Filtration is by Eden 501 and a small “fist” size air pump paired with a 6" air curtain. I only have experience in keeping planted tank and would love if fellow Arowana Lovers… Experts… “Old birds” to advise me on the following:

Pics are under my gallery, is it possible for the gill to “Close up”?

Ph level : Please advise
NO3 : below 10… right?
Water current: Is concentrated on the left side of the tank, from left to right. Is it ok??? Please advise...

Do I have to look out for any other water perimeter?

Thank you...

Stoner