One thing I've noticed though is that they get very aggressive towards each other as they grow..
I bought 3 when they were around 2''... I've had to separate the one that grew the fastest from the other 2 as it was attacking them... since I've done that, the 2 remaining ones together wont stop fighting with each other.. so I'm going to have to separate them also..
They were fine for quite awhile.. but all of a sudden they went gangster on each other.. was pretty unexpected!