smpage;3702271; said:
One oscar in a 60 gallon is plenty.

'specially if you have a common pleco with him/her. which will outgrow your tank and then some. And for personality particularly w/ Cichlids. Oscars are always one of the tops on this list. A happy healthy Oscar is frisky as a puppy. depressed/sickly ones will mope around the tank.
An putting a pair of anything cichlid wise with your remaining one is a bad idea imo. Oscars are large, and will bully, but I've seen pairs of most your smaller SA's beat them up good, and a pair of convicts kill one. When push comes to shove, usually the Oscar gets the worst of it. Getting 2-3 other species. and 1 fish per species. may or may-not help.
The only suggestion i've seen w/ a personality rivaling Oscars is a puffer. and a majority of those not only need their own tank, but fairly moderate/experienced care/requirements due to their beaks and natures.
Most Cichlids will have varying amounts of personality similar to the Oscar's.
I personally would get rid of the pleco if it was a common, get a Royal or other "mid ranged" size pleco. Because I like pleco's and I like not haveing to scrape all the side. But no tank "needs" them as most stores will tell you. It's a gimick to sell you something, nothing more or less. They are extra bio-load, and get messier the bigger they get. And they get big. Magnetic scrapers are a great invention.
and a single Oscar in a 60 Gallon well fed, w/ good water Quality is a puppy in a box pretty much. My guy gets hungry he bangs the tank, he follows me around the room. and I can't walk close to the tank w/out paying him some attention or he gets growly. He didn't come from the petstore like that either. Just like any pet you have to nurture the responses. Take his favorite foods and "tease" him by showing him threw the glass and moveing it around. do it for a few moments then drop it into the tank. They learn very quick to "beg" and "make cute faces" to con you out of treats. My guy is always swimming around investigateing his tank. Changeing the decor around to suit himself, putting in things for them to move around.
And they can scare fairly easy by major disturbances, tank-mate removal/death, rearrangeing the decor. and mope around the tank. My guy will go into this mode when I go away, and someone else feeds him. She shakes her head, because when i'm here and she comes over to hang-out he's happy and bounceing around begging from both of us. But she says when I"m gone he won't even come up for his pellets until after she leaves the room, and comes back to check on him. And he just sits in the back eyeing her.
Lame as it sounds, Give them abit of affection/interaction, and you'll get alot of personality back. That goes for a majority of fish. Or you may have simply gotten that unlucky 'n gotten a not so bright Oscar. But i wouldn't expect anything from a sick fish, hopefully he'll heal.