ID/Reference:
  
Fishbase
  
Tropica Plants
  
Danios.info
Loaches.com
Madagascarfish.org
Planetcatfish.con
Potamotrygon.de
Scotcat.com
Snakeheads.org
  
Akvaforum.no
Aqua-fish.net
Aquariumlife.net
Aquavisie.retry.org
Fishprofiles.com
Naturaqua.fr
Peteducation.com
Reeflex.net
Saltcorner.com
Seriouslyfish.com
Theaquariumwiki.com
Thepufferforum.com
Welsfans.de
 
Fish, Krill, Algae...

Aquarium Shops Denmark:
  
Neonfisken
Bonnie Glostrup
Bonnie Rødovre
Planteimporten
Rebæk Aquarium
Fik'ken Amager

Aquarium Shops England:
  
Britain’s Aquatic Superstore
Pier Aquatics
Wildwoods

Public Aquariums:
  
Berlin Aquarium, GER
Blue Planet, ENG
Danmarks Akvarium, DEN
Ferskvandscenter Aqua, DEN
Maretarium, FIN
Sea Life, Brighton, ENG
Sea Life, Helsinki, FIN
Sea Life, London, ENG
Underwater World, SIN
Vancouver Aquarium, CAN
Øresundsakvariet, DEN

Other Websites:
  
Alf & Anita Killies, SWE
Akvarieviden, DEN
Discus, DEN
Oliver Knott, Aquascape, GER
  
Akvarieplanter.dk
 
Amazonas Magazine, GER
Aquaflux Netmag, BRA