me and the gf went to the pet store and our son loved the gold fish and i had a extra 10 gal tank kickin around. so we got him a Small Red Cap ORANDA Its cool its body is very gold but his head is red cap

no white on him.
anyway, We got Blue rocks that Make him/her look pretty. and we got a Bubble wall going on he loves it he swims in it. and a hand full of multy color sparkly Rocks they are much larger then the grave about 1/2 to 3/4 per rock.
i know the ORANDA gets pretty big but the gf is going to buy this pirate tank set up thats larger then this 10gal. anywho do you think that His Small oranda needs a friend?
what "SMall goldfish or anything can i put in the tank with this little dude" i think the pirate set up tank is like 20gal-22 gal somthing. anywho is there any fish or crab anything that can go with him. any breeds of goldfish taht dont get big? The fish store has Millions of Comet Feeder gold fish do they grow larger?