On 17 Jan 2004 I put my first aggressive fish into my 55 gallon tank. At that time a number of community and semi-aggressive fish including 2 diamond tetras, 1 emperor tetra, 1 black neon tetra, 1 silver lyre-tail molly, black molly, blue powder gourami, 2 cherry barbs, 1 dawn platy, 1 pleco...