just wanna share my experience.

it seems there are some crazy fish out there. last time, i bought about 11 mollies of different colours. On the way back from the shop, I noticed that 1 black molly was aggresive to all the other mollies (while still inside the plastic bag). My instinct told me that it was better to have 10 happy mollies that 11 troubled mollies. So out went the 1 black mollies So far all the 10 mollies are happy. I even have 4 molly babies of different sizes