From what you guys are all saying that would make sense as our oscars all grew up together but they dont seem to bother the other fish in the tank with them in fact we threw in some little cons with them and they chased them to the bottm and 2 days later they were all swimming around together. We noticed tonight our lutinos maybe trying to spawn not sure if they are big enough at arond 7 to 8 inches hope they do though will probably have to take the eggs away afraid the cat fish may eat them during the night.