I have 2 oscars, 18 and 12 months old. The older one is twtiching and acting crazy but it is also changing colors. The tail will go from total black to almost transparent with 4 black lines on it back to all black. The underneath of it is also turning an organgish color???? Any ideas why???

Difficult to say from your description but it could be a sign of aggression, on the other hand it could be a kind of breeding ritual. My male and female Oscar used to which and change colour.

I was thinking it might be a mating thing but in every thing I have read about it I can not find any thing about changing color so I was a little worried. Thanks for your relpy!

Many animals change colours for different reasons. You may find that the Oscar changes colour when the tank lights are put on. This is because it is much lighter in the tank. Oscars often change colour if they get angry as well.

Could you please only click the submit button once. You keep entering duplicate posts. Sometimes the page takes time to refresh so you might think it is not going to work, don't worry it will