Today I noticed that my Oscar has gotten EXTREMELY aggressive all of a sudden. It is in a 150 gallon tank with another smaller oscar, a convict, jack dempsy, and a firemouth. The bigger oscar is about 6-7 inches and the small one is about 3-4 inches. I got the smaller one about a month ago and have had no problems with them. Now the larger oscar has his mouth open and just starts charging into the glass and at the smaller oscar. What is wrong with the larger one? I think (all 3 of the thermometers say 3 different tempatures) the tempature of the tank has gotten a little higher (I dont know why), could this be a problem? What can I do before some fish ends up getting hurt? Thanks in advance.
Sudden Aggression by Oscar
- Thread starter ConvictKid
- Start date
There was a thread around here sumplace about higher temp making there fish get for aggresive and have brighter colors. Try lowering hte temperature a few degrees. Then if it solves the porblem, bring it back up a week later to see if it gets aggresive again, then you could be 100% sure that that was the factor of the aggresion.
That is what my Oscar did. He (or she, not sure) lived with a Blood Parrot for over a year. They grew up together since they were both 2" long. I never saw them fight or chase each other once. They even slept in the same flower pot together. Then one day my Oscar started chasing after my BP with his mouth open. He would just corner my BP in a hole in the driftwood, and wouldn't let him out. I tried rearraning the tank, adding new tankmates, lowering the temp (since this happened during the warm summer months), and nothing seemed to work. I finally had to get rid of my BP before my Oscar did some serious damage. I thought it was weird that it happened so fast. One minute they were fine, and the next minute my Oscar was intollerant. My Oscar still attacks the glass once in a while ( I think he sees his reflection, or he gets a wild hair up his butt). A few other people told me that it happened with their oscar too. They just said that when an Oscar is growing up they have very different personalities then when they are young.
You could try seperating the larger Oscar in another tank (if you have one, or a bucket will do). Leave the little one in the tank, rearrange the tank and then a few hours later put the big one back in. If you have another tank for the larger one, it would be better to add him back to the tank a few days or weeks later so the little one gets to have reign of the tank. Then when you add the larger one he will be the new one and maybe he wont be such a bullie.
Just my experience. Hope it helps.
You could try seperating the larger Oscar in another tank (if you have one, or a bucket will do). Leave the little one in the tank, rearrange the tank and then a few hours later put the big one back in. If you have another tank for the larger one, it would be better to add him back to the tank a few days or weeks later so the little one gets to have reign of the tank. Then when you add the larger one he will be the new one and maybe he wont be such a bullie.
Just my experience. Hope it helps.
well my oscars were like that for about a month chasing each other around then they spawned so yep i thought i would tell you that with no relevance to the story