Hello, my name is corky, I just bought this 38 gallon tank from someone who was moving and couldn't keep it. I had 5" discus that I tried to breed 20 years ago, but these guys I know little about. They keep shaking their tails up and down, like a real fast shiver, what's up with this? They're between 8 and 10 inches. they're on page 18 of the member fish gallery, couldn't get the pics to work here.

Welcome to OFL Corky. If I am understanding correctly, the behaviour you described can sometimes be linked to aggression. However, a breeding pair will also do this on occasions.

38 gallons is a tad on the small side for one Oscar so you should start thinking about upgrading at some stage. If you can't do that at the moment, make sure you test the water on a regular basis, ammonia, nitrite and nitrate can all be a problem when keeping large fish in tanks that are too small.

Most have you on board and look forward to seeing some posts from you

Welcome aboard Corky!

Had a look at the pics, beautiful Oscars you got there Looks a bit to me like they have some indents on the head, could that be old scars from HITH? Well you got briefed already, so enjoy your stay!

Thanks for the welcome, great site.