Did you say 520Liters? ok ... that's about 137 gal ... lots of stuff you can do!  Sure you'll get tons of suggestions ... oh boy! How about a big Barb Tank!! You would easily double my stock (see below).
Have fun!
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75g Planted Barbs Denison, BlackRuby, Tiger, Albino Tiger, Green Tiger, Cherry, Gold, Checkered, Odessa.
NonBarbs Cardinal, Neon, RummyNose, Bloodfin Tetras, Z. Danios. 1RTS. Amano, Bamboo, Ghost & RCS. 20g Long Shrimp Tank RCS, Tiger, Amano.
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