cabombas, hornwort,twisted vallisneria,pygme chain sword plant, african tiger lotus are nice but they ain't amazonian like the others.6 cory's of any type for the bottom will be nice in a 25 g as for the middle maybe borelli's dwarf chilid but be warned males tend to be territorial, angelfish, bleeding heart tetra or red phantom tetra. oh yeah for the top maybe hatchet fish.