I was inspired by this thread to give Mollies a go. Local Petsmart had a bunch but they were pretty small so I bought ten. Did the drip acclimation for three hours then temp acclimation, turned lights off and dropped them in.
I knew right away it was not going to go well, they all clumped together at the top and were super slow swimmers compared to everything else in the tank.
The carnage started about 20 minutes later by surprisingly enough the cardinal fish, they were each swimming around with a tail sticking out of their mouth then the China wrasse started bullying them very aggressively and pretty sure one swam into an anemone. Next my red tail trigger that never bullied anyone took a major chunk out of one and that was it I put the remaining in my sump where one looks to have lived through the night the others swam into the Chaeto and could not get out, I pulled a couple out before I went to bed and they swam away happily but did not learn their lesson as they swam back in over night and are dead now.
Moral of the story; these are not for every tank, they are slow moving and not very bright never trying to hide at all, power heads were tossing them around and they become too tempting for an easy snack. I have added small fish to the tank like Blennies, gobies and small wrasses and never had any issues like this because they would immediately hide until they were unnoticed by the tankmates and knew when it was safe to come out.