05-24-2013, 01:53 AM
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Oscar color changes
Hi again everyone, I have two small juvi oscars - both equal size and (for now) mellow temperament - these guys are housed with a few smaller jack demps that are already starting to live up to their boxer name, but keep to themselves...and all temporarily live in a heavily planted tank with community fish too large to be eaten (for now) but numerous enough that the small cichlids come out and swim freely without fear. All already assoc me with food, and rush forward when I approach the tank.
Recently, I notice that one oscar tends to quickly pale and just as quickly rtn to a dark coloration. This happens as nothing out of the ordinary is taking place in the tank. The other Oscar remains dark, both appear equally active and constantly hungry. I can't place what is causing the changing (though quick) of the oscar that goes pale. This guy never appears stressed and is continually hunting for food - seldom if ever stationary. Am I missing something? Or is this normal? Besides stress, what would cause this too happen? Should I be concerned??? (120g tank, with water perimeters ideal for an Oscar re: ph, temp, ammonia /nitrate levels -weekly water changes and tanks been up for apprx 1 year).