Moonlight gourami swimming like it has a weight in its tail?

[Carefree_Dude]

There is something wrong with one of my moonlight gouramis. It has a lot of trouble swimming, and its tail is always sinking downwards (which makes it point its head straight up sometimes). any idea what is causing this?

 

[Water]

Water parameters? Pics of the fish? Sounds like something is wrong with its swim bladder causing it to not be able to balance properly..

 

[Carefree_Dude]

0 ammonia, 0 nitrite, <25ppm nitrate

Also its got a strange line down its body. it developed it back when it was a baby. overall, this fish is nowhere near the color or beauty of my other moonlight gourami.

 

[Water]

It is either SEVERELY underfed(which I doubt) or it has internal parasites.. Does it eat at all?

 

[Carefree_Dude]

It eats very well... although, I've noticed its body is very slim. Its been eating nls exclusively for about 3 months. It gets both flakes, and thera a pellets. It sometimes goes after the massivore I feed my crayfish

 

[Water]

Any possible tank mates that could be picking on it? Could it be the crayfish keeping it from resting at night?

 

[Carefree_Dude]

I've never seen anything pick on it before. The crayfish usually keeps to herself and doesn't bother anything. I often see my other fish huddled up next to it in its cave. Other fish include catfish, bichirs, angelfish, and ebjds. The ebjd are still really young,