ya 8 angels will be pushing it you could probably do 6 angels, the angel's natural habitat is slightly acidic water like 6.5 which is what culinaryartcook said. On the plants u want tall big leaf plants like swords with a sorta slant in their leaves cause i read somewhere that angels lay their eggs on amazon swords or something in the wild cause of the perfect angel and the big leaves. If you really wanna do 8 angels i think cleaning the tank more often is a must cause then the angels feel like they have a bigger space and new territory, good luck on the angels, cant wait till i get my angel tank going =)