Well I just ordered a 2" pearsei and a 2.5" bocourti for my 220 CA/SA. I will let u know how they work out! Good luck with your search
I've never personally kept uaru but from what I've read, your current stock will beat on a uaru.
I currently have a uaru(as been with me for 4 years)and he is the aggressor in my big tank,the pearsei,bocourti stay out of his way and they are bigger than he is.