That would be great if you could explain
When you go to buy them, don't get any with horizontal lines- these are stress lines. The vertical lines are very good, means they are in good health and are called breeding lines. It's also best to pick ones of the same size/age if at all possible. They do best in even groups. 6+ is best you might be able to do as many as 10 if you can find enough good ones!
A good way to tell if they are going to do well in a group are when you are picking them out- ask if they have been fed- and once you pick out the healthy ones- stick your finger in the top of the jar. If the nibble your finger in the first 10-15 seconds, they won't be a good fit. If they seem aggressive basically.
Next, once you have them home, keep them next to each other so they can interact. Then let them acclimate by adding small amounts of tank water, and pouring out their water 25% at a time. The cups are hard to float, and If you do it that way, you can just pour all the water in with them, avoiding the stress of netting.
I have had success adding the most aggressive first- so she can claim her territory. Then go down the line, adding one at a time. The first 2 days they will establish a hierarchy- and there may be flaring of the gills while they figure this out. (Under the gills is a good indication of what color they will be when they are happy in a nice big tank!)
Minor fin nipping is normal in the first 2-3 days hike they figure out who the top dog is. If there is one that is more aggressive, the best thing to do is to put her in a breeders net. It sounds crazy, but I swear it works, after a few hours, let her out, and just like time out- she will swim around to the others almost ashamed of her actions apologizing to the other girls. Haha it's too funny!
Once they have their order pecked out things should settle down. And the other fish (mollies and danios) can swim in and out of their territory with no confrontations. They will each pick their areas, hiding places, and maybe even a BFF. I had 2 in my group of 12, who looked just the same, white, with pink and bright yellow, who were together all the time. Haha I like to think they were lesbians. Hahahah Anyways- they love the same temp and PH of your other guys. And they should be very happy.
Any other questions? Feel free to ask!