oscars are gonna need at LEAST a 4ft tank. Preferably much bigger. They aren't agressive, just greedy, anything small enough to fit in their mouth (and they have big mouths) is basically gone. They won't 'kill everything except amoured catfish' like esfa says. Thats rubbish, I've kept oscars with loads of different fish and never had problems. They aren't like many of the other fish in the cichlid family which will fight just for the hell of it. In a big tank you can have a very good community of fish. Stuff like silver dollars, silver sharks, bigish catfish. even some of the barbs, t-barbs, tinfoils, large tigers can be kept with these. They will move stuff around in the tank so everything must be secure. Need loads of filtration, so a big external filter is really a must. Temps of 24-30 are ok, and standard tropical chemistry is fine. They are prone to hole in the head which is caused by poor water quality so keep the ammonia and nitrite to 0 and nitrate as low as possible. feeding wise, decent quality cichlid pellets, Hikari Gold is fantastic stuff, avoid aquarian and king british, quite high in fats and oils which is bad for your fish and leaves an oily film on the surface of the water. Meaty foods like mussels, prawns, whitebait. don't feed things like beefheart as again it is very fatty. When they are small, flake is ok but pellets are ideal, easy to regulate the amount and if you use a good one then the growth rate can be mental. They can potentially hit 14-15inches in length, 12-13 is more common. Should grow quickly in any case though, so if they aren't growing check your water chemistry, up the feeding and watch their behaviour.
Good luck though, quite a cool fish, can be tamed quite well. If you need any more help drop me a PM or something
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