I have had peaceful Oscars and aggressive Oscars. You won't know which you have until you get to know it. Certain varieties are more aggressive then others. Pink Oscars are very laid back. I read that Tiger Oscars are the most aggressive of the group, but I have found that this is not true. My common Oscar (AKA Zebra Oscar) picks on my Tiger Oscar constantly. He also harasses other fish to death. So far he has killed one shark catfish, Black Ghost knifefish, and even my new barracuda. The knifefish and the barracuda were bigger than my Oscar. I've only had this Oscar for a month! He has tripled his body size in just 4-5 weeks. I feed them Cichlid Gold pellets in the morning, high quality flakes in the afternoon, and bloodworms in the evening. I give them a bedtime snack of the pellets. They eat feeders only once per month. Remember, if you want you Oscar more docile, feed it less protein and more plant matter (like what is found in tropical fish flake food). Also, Oscar's should not be kept in a tank smaller then 70 gallons. The general rule of thumb for fish is one inch of fish per gallon. Because of the waste they produce, it is recommended that Oscars have three gallons of water per inch of fish. If you have two five inch Oscars, you have ten inches of fish all together. Ten inches of fish times three gallons of water equals a tank of at least thirty gallons. Most Oscars will reach a length of 10-14 inches when fully mature. If you have two fish that are twelve inches long, then you have 24 inches of fish...times three gallons of water per inch...equals a tank of no less then seventy-two gallons. Some people can keep their Oscars with other fish much smaller then the Oscar. Just remember, even when they are raised together, the Oscar may still eat it eventually. Lastly, Oscars must not be kept with "community tank" fish, unless you want them to be eaten. Just because the Oscar is too small to eat them doesn't mean he won't chase the fish (sometimes to death). I adore my two Oscars. I have a five inch Tiger Oscar. The funny thing is that it doesn't have ANY orange on it. It is gray/black. Very cool. My common is about four inches and is the leader of the tank. He gets so excited when he sees me get close to the tank. Regarding feeding, I don't suggest buying feeder fish of any type from a pet store. Unless you plan to quarantine the feeders they will, eventually, give diseases to your main tank. I suggest breeding guppies. I have a three gallon with three guppies. I also have a batch of one week old fry. Oscar's are prone to hole-in-the-head disease, but you can buy a preventive at your LFS.
Albino Oscars will be pale white, retaining orange and red coloration (potentially vivid), possessing no dark (black, brown, green, gray) coloration. Eyes will be red or pink. Many people purchase what they think is an Albino Oscar but if the fish is displaying any dark (black brown, green, or grey) coloration, it is not an Albino Oscar.
Oscar Fish Advice Forum: Adding some pink tails
Check compatibility for Oscar with GloFish, Moonrise Pink Tetra
Albino & Lutino Oscars - Albino and Lutino Oscars are fish that lack the normal pigment, the difference being that albino have pink eyes, and Lutino dark eyes.The best tankmates for Oscars are Large Plecostomus and other large Neotropical Cichlids such as , , , and other cichlids from South America which are the same size or bigger. There are several varieties of Oscars, Pink Tiger Oscars tend to be least aggressive, thus never mix Red Oscars or Tiger Oscars with Pink ones! The easiest way how to find out who's the boss is during feeding - the fish that eats first and most is the boss. Remaining Oscars are lower in the hierarchy tree. Think twice before buying an Oscar as plenty of people end up with Oscars only even though they've planned a community aquarium; The Oscar fish will simply eat small species!