This is a website (in portoguese) mainly dedicated to aquascaping.
It highlights than other sites because its articles are quite detailed and show the sources of information (which is not to be underestimated).
I recommend everyone to read two articles in particular:
'Tetra Neon Cardinal: Equívocos e Realidade' and
'Os males da introdução de espécies exóticas em ambientes aquáticos'