my oscar is behaving oddly,he was swimming round in circles really aggressively,now hes up in the corner of the tank,hes been there hours now,has anyone come across this behaviour before look foward to hearing from you.

how long have you been keeping it? any tank mate/s?
size of the tank? water parameters?

If you've done a recent water change or moved things around in the tank he could be letting you know that he don't like it. Are his eyes clear? Any fungus or ick? How is he breathing? What size tank? How is he eating?

hi,ive had him about 4 months,he in with 2 parrots 1 pleco+a jack dempsey in a 6 foot tank,tested water this morning,nothing wrong with water.

In my experience it was my pleco that made the tank smell at times. He was a filthy little creature. Keep an eye on him, pleco's have been known to suck on sleeping fish. My small catfish killed one of my Jack's that way so now I don't have either one. Does it still smell after a water change? Do you use conditioner? Salt?

Well he is letting you know that he is mad about something....

I would still do like 20% water changes a day to see if this helps

Is he breathing ok?

Is he the dominate fish in the tank or are there other fish maybe picking on him

tank doesnt smell,he gets on well with mt pleco,i use prime water condtioner,ive just watching him and he seems to have settled down for the moment.

hes far to big to picked on.

yeh hes breathing ok.

he seems to breathing ok,hes just swimming round in circles then he stops and looks up at the surface of the water,its really weird.