This fish doesnt need to be around "breeding time" to be aggressive. Just having a single male is enough for it to hold a large section of the tank to it self. If you have a smaller tank it will probally kill all tankmates.flatcam1 said:the aggression usually comes out at breeding time.
Also,there is often a big size difference between the breeding pair and after the eggs are fertilised you can do two things
1.take the male out and put it in a separate tank
2.put in a clay pipe for the smaller fish to hide in
these 2 things are not guaranteed to keep your smaller fish alive, they are just to increase the chances of it surviving.
Hope this helps!
best regards, flatcam1