I am about to start setting up a new tropical tank. I already have a tank but only have general tripical fish, guppies, neons, platties etc. In the new tank I hope to have angel fish, gourami etc. I would like to put a selection of angelfish in the tank ratehr than all one type, is this likely to be a problem, are there any rules for angel fish being added to a tank i.e. any specific order etc any fish I shoudl avoid having in the tank/

Thanks