Oscar or illness?

[ikevi]

So my Oscars have gotten to be ~6inches and I have noticed they have gotten a little more grumpy if that is the term with the other fish around them.

And now I have been waking up to find usually about 1 3-4 inch fish dead a day. I can say for sure that they appeared to be fine the day before so my best bet is that the Oscars snuck up and just bit them hard on the body. Would that do it?

If not what else would just cause dropping with no real signs. (I see bight marks on most but again that could have been caused by other inhabitants after the fish suddenly falls ill.)

(I fully expect it is the Oscars, but eh it never hurts to get advice.)

 

[aquariumguy2300]

Oscars probably would kill other fish like that. Even if the fish are close to the same size. I had a guppy beat up my angel so bad once, I had to move the bad fish to a different tank! I wonder why the angelfish didn't eat him.

 

[Nick660]

Yep, to me it sounds like you've got a serial killer on your hands!

 

[Nabbig2]

Yep...oscars can get very aggressive. Even more so towards each other.

 

[deepblue101]

bad oscar