0
OK aside from acclimating and such.. These fish will be VERY aggressive when they get older(especially against community fish) and your new tank will need to be cycled which will make the process take another 20 -30 days. 50 days is enough time for mbuna fry(when properly cared for) to put on another inch- inch and a half or more. I recommend you get a 55g or 75g as the new tank, as auratus get fairly large(you could also add more mbuna into the new tank if you wish). Also, what you will need to do so that you can safely stock the tank ASAP would be to buy one of your filters for the new tank now( I recommend either 2 Aquaclear 70s for a 55 or 2 aquaclear 110s for a 75). Hook the new filter up to your community tank and allow that filter to cycle the media. Aside from this all you can do is do frequent water changes to keep stress down and keep an eye on them. As stated, you might not see territorial issues but mbuna fry will nip and "play" CONSTANTLY. They are very active fish if they're healthy and you might notice some issues with the smaller or more docile fish in your tank.
Coastie-to-be... hopefully.