200L..Hmmm.. Go for 2 or 3 Aspito's or Blue Rams, A large school (30-40) of Tetras such as Embers or Cardinals, The danios that you have will stay up the top and the other tetras will stay in the middle of the tank. Then add some Catfish such as corys, 8-10 would be a nice sized group.
YOU WANT A FINE GRAVEL TO PLANT WITH!!!