I was just wondering would a 20 gallon long, be good enough to house a trio of electric yellow cichlids. 1 male/2 female-male is 2.5", and both females are around 2". Or would doing this be a big NO!
You are really pushing it. I had 2 species of peaceful mbuna in 33g before, one of which was Yellow Lab. They were doing ok, and bred fine. 33g has another 6 inch of length compare to yours.