I have 1 Albino Tiger Oscar and he is about 6 inches long. Should i have a bigger tank than my 33 gallon. And should i put other oscars or fish with him? (If yes what type of fish)? 
ihob78 said:I would go with at the very least a 70G tank with a deep sandbed and a few large rocks. Don't bother with any plants becouse he'll just dig them up. Weather or not you put other fish with him is up to you but if you are really concerned with his comfort you will get a bigger tank and probably not want to only have one fish in it , as they are semi aggressive check out this compatability chart.
http://www.liveaquaria.com/general/fwcompatibility_chart.cfm