thanks guys! the bgk is pretty fine!! my algae eater is yellow (gold), and my leopard pleco is about to be given to a friend.. because there is no enough space here for him!! i have put the new angelfish in a net, because i thought that the old one will get used to it before it kills it!! thanks.. 
!! if i add another angelfish the old one will attack both?
!! if i add another angelfish the old one will attack both?
