I had 3 baby oscars and 1 common pleco but I wanted one more oscar so I bought an albino today. I have a 100 gallon tank no problem there but the new oscar is chasing the other one around and nipping at them. No visible damage but should I be worried? If this continues how long should I wait before I do something and what should I do?

Well, first of all, do you think you can make your picture any bigger, I can't quite see it? you need to reduce the size of the photos before posting them, we are having to scroll right across the page which is quite annoying when you want to read what people have said.

Okay, your tank isn't big enough for four Oscars, it's as simple as that. What more can I say, aggression problems can be made worse if you keep Oscars in a tank that is so small. And because you have introduced another Oscar into a tank where a group of Oscars have probably made themselves at home, they may not like the new intruder. I don't think we can answer your question conclusively, we can just hazard a guess at why Oscars do this.

Give them some time to settle down. You only need to do something if one is getting
damaged or one isnt eating. If they are still at it after a week or so them remove
the aggressive one

they atr fine now but whoat would i do the the agressive one?

try takeing it back to were you bought it they might help

They seem to be doing much better, the jack was staying uder a rock for about a week but he is mixing it up more and more. He is so pretty hope it works out!