i have a 6.5x2x2 tank empty and was thinking of a few oscars. ive never kept these before and thought i would ask your opinions as experienced oscar keepers. how many could i keep in a tank of this size safely? i want some other fish in there too but want to keep it to just a handfull of fish rather than a tank full of fish. i would like a catfish or 2 for the bottom and a few dithers. also how can you sex an oscar? is it advisable to keep all males or mixed or all femles? any other info would be appreciated to help me decide. general stuff like best temp, what you guys feed them etc etc etc