Per popular request:
"If you have a sorority how do you keep them from fighting while you are working or out for the evening ?"
Sorority girls can be nippy now and then. Try to be observant when you feed them before you go to work. If you see a storm brewing, try to 'head it off at the pass':
1. Time out a trouble maker in a fry net.
2. Protect a potential victim in a fry net.
3. Feed them a special treat.
4. Put something new to explore in the tank.
5. Take something out of the tank.
6. Keep the lights off.
7. Pray (did I mention that already)?
The worst does happen occasionally. Be prepared with fry saver nets and a QT tank, containers, salts, etc. Know how to heal wounds and how to condition injured fish. Know when and when not to panic.
I wouldn't start a sorority with less than a 20 gallon set-up. The more girls in the sorority, the less chance for 'concentrated aggression' to occur. You will need a heavily planted and decorated tank so they girls have plenty of chances to hide and escape aggression.
Fish can be added later... generally it's good to introduce a couple at a time, so the newcomer isn't singled out. There are several different methods to do this.
I reccomend QTing the newcommers until you are sure they are healthy. Then put them in a fry saver net in the sorority tank for a few days, so that all the fish are introduced in safety.
After then seperated introduction, do the full introduction. I like to do this on a water change day, when there is plenty of commotion in the tank. Net all the 'regulars' and place them in a bucket of tank water. Give them all a treat when they're in the bucket.
Some people say to re-arrange the tank before the newcommers arrive, to reduce territorial issues. I keep re-arranging as an 'ace in the hole', and use it only if I have to (so far, I haven't need to ).
Release the new girls in the main tank, and give them some time to investigate their new home. Leave the fry saver net in place. Give them a light feeding and then re-introduce the regulars, in reverse pecking order (lowest to highest). Watch the interactions between the newbies and the regulars.
If you see a fish being overly aggressive, or if a fish seems to be bullied, remove one fish (either the bully or the bullied, not both) to the fry saver net.
Wait a couple days, and try again. Repeat as necessary, until everyone plays nice.
If you have a super aggressive female who won't chill out, she may have to be housed alone or returned to the pet store. Be prepared for this senario as well.
If you can stand the roller coaster ride a sorority can be, it can be a very rewarding experiance.
There are a number of threads on this forum on this subject; if you are serious about a sorority it would be advisable to do a forum search and pull up as much info as you can...