I just bought a juvenille and put him in my 20 gal, hes getting moved up to 55 when its done cycling though. I am keeping him with my peacock eel and they are getting along great, they are sharing the same driftwood stump together. I am guessing from my experience, not from knowledge of the fish itself, that a peacock eel might be a good tankmate
As a rule of thumb, compatibility should never be based on how juvies get along.
Because as they age, fish known to be aggressive develope that aggression usually with age.
I am not familiar with the eel you have but just be careful