Thats a nice lookin oscar. The reds were always my favorites but i prefer the darker morphs.
Can you post me a photo?
My intention was to buy him a custom tank, and have a couple tankmates but at the time we were remodeling. Now I am shopping for a bigger tank.
In smaller tanks with not so many cichlids, you will have this problem, of the fish on the bottom of the pecking order getting relentlessly bullied. With more fish, the dominant fish's attention will be more equally distributed, and nobody would end up like photon, hopefully. I would recommend getting the 100g for them, and putting all the africans in there, while simultaneously adding a few more. Hopefully this would allow the aggression to not be focused on the fish that are subdominant.
That's kinda how I got here

Get a bigger tank and then add more fish.
They were in a 30 housing:
Two 2.5" convicts
One 3.5" bristlenose pleco
Three 3.5" USD cat
One 4" golden mbuna
One 4" mbuna fem
One 3.5" Yellow Lab
One 4" peacock
and
One 4" mbuna (Mojo) who is still in the 30
I moved them to a 55 and added Buttercup, Cromwell, Photon, and Sunshine (now deceased ;( ) in pairs, 2 days apart, moving all the deco around, and it worked. And then, when I fed them, these fish had the audacity to grow! . . . and then vote Sunshine out.
Now I think it all would have worked better with a bare tank and minimal substrate, to prevent turf wars.
I move the stuff far about at each siphoning, and then they all have to go house hunting. But after 2 days they are fighting, and I move it again. Anyhow I had removed Mojo. Last night Photon, and now the fighting abated.
Also I removed all the sand. Buttercup had decided to mine the entire bottom like some atomic dredger, and was just plugging up everything and making a mess. I gave them some natural gravel and pebbles and rocks. He can spit those! LOL