i wouldnt get a truly fully grown angel, because one, they carry a hefty price, and two, they might not acclimate to your tank as well as young ones. i would look at the biggest size the LFS has and the smallest size, and if you are lucky, they will have medium sizes in between. if they only have a really tiny and a really big, then you might want to go to petsmart and get their "large" which is really about half size.that should be fins as long as you get the 3 other females. i have found that if the angel is the only one in the tank, they take the whole tank as their territory and then simple ignore the other fish in it, or they veiw them just as fish that live with them but do pose a threat to their territory.