I just introduced a new albino oscar to my 125 gallon tank. It is completely cycled and I only have two bichirs as tank mates. After purchase I kept the fish in the bag to get acclimated to my water temp. I took all the precautions to ensure it would be as smooth of a transition as possible but my fish seems to be super stressed. I've tested the water several times and all checks out ok. My new fish is laying on it's side at the top of the water on the side of the tank. He's still alive but I'm worried. Is this normal? Is there anything I can do to make the fish less stressed, etc.?