the red eyes are just his eye colour like some people have blue,brown,green etcetc.
Getting him a tank mate would be a good idea, can I recommend getting him a bichir? I know someone with an oscar and a bichir and they're best buds hahaha =]
although I think they're seasonal fish?
I'm not sure haha do a little research hope I helped!! =)
orrr;
firemouth cichlids
chocolate cichlids
red devils
red hooks [you should get a group of at least 6]
a catfish
flowerhorn [really funny looking hahahah]
green terrors [they have really cool colouring]
convict cichlids
bichirs
clown loach