If all in a 2ft tank then thats too small...
As to sexing how big are they?
Angels are difficult to sex, only 100% way is when they come to breed they breeding tubes, "venting" so many people have theorys,but dont listen to them 100%
keyholes are alot easier, here look at link,
http/www.fishforums.net/index.php?/topic/65964-keyhole-cichlid/
sorry i never updated the stock list, and soon as i get a new place they will be going into a 5ft, but i should be in a new place in about 1 month .
back to the fish.
the keyholes i purchased, both the same age, and ive found that one is alot smaller then the other and also the smaller one has made a territory under the slate rock.