So for almost two years I had a very peaceful 40 gallon with two Angels and 4 Bolivian Rams. Temptation got the best of me, at a LFS
there was this lonely Blue Ram all by itself looking real good, nice fins and coloring so took it with me. Being just one inch, I was worried the other fish would pick on it.
Man was I wrong, this little guy created a war inside the tank, constantly chased the Bolivians into hiding, chased one of my Angels... What?
Next day both my Angels were at war with each other.
Long story short, took him out after two days and restored peace back in the tank. I've been keeping fish for well over 30 years, from Africans to Discus and never saw a little guy make so much trouble in a tank. Lesson learned with Blue Rams!