Peaceful Fish

[brendac]

I would like to know...why cant I put 2 dwarf angels that are both peaceful and 2 butterflys thats both peaceful along with 2 peaceful tangs in the same aquarium? If they are all peaceful they will not fight... right??

 

[fishmamma]

Because many fish species are peaceful with everyone but their own kind, and in addition to this they can sometimes be peaceful with their own kind as juveniles but as they mature the agression grows. There are of coarse exceptions to this rule since each fish has an individual temperment.