Hey needs some help! I have a tiger oscar and he's suddenly gone Ill and looks like he's only breathing out of on gill I've tested the water and all levels are correct, I have a 240 tank and one royal plec as his friend. Does anyone have any ideas?

Hi and Welcome,

Can you please post EXACT water readings, for Ammonia, Nitrite, Nitrate, and PH.

Are there any signs of injury?

Yes it's 0 nitrite, 7.5 nitrate, 0ppm ammonia and a ph 8 and he does seem to have injured himself. Thou he has got a bottom fin that was damaged when we got him and won't grow back properly.

Hey there!
Heres an old thread i made some months ago;
www.oscarfishlover.com/oscar-fish-advice...-one-side-not-moving

If waterparameters are correct, it seems an oscar can "choose"a side of his gills to breath through.
It's odd, but my Oscar did the same thing for some time.
And quit it after some time.
No pathological thing, in my case.
Damage may be the cause though in your case, and the o may have hurt a nerve.
Fingers crossed for you.

I meant doesn't seem to have injured himself

No injury wouldt mean it's the same response as on my fish.
Just keep a close eye on him.

Cheers noddy will look at the thread

Noddy..... Is da man.... Respect bro....

Keep your water as good as you can to help things get better is about all i can suggest