E. Manufacturers' sites

F. Manufacturers' websites.
 
Aqueon/All-glass Aquariums. Manufacturer of tanks, hoods, stands, etc.
Aquarium Pharmaceuticals:  Water tests, conditioners, pH buffers, medications. Some basic product  information in the Aquatic Reference Center.
Dupla:  High-tech CO2 injection at its sleekest.
 Hagen: High-design aquarium products.  Quite informative. On-line service manuals.
 Hikari: Marginally informative blurbs about their well-respected processed feeds give no information on ingredients or nutrition.
 KentMarine
 Kordon:  Product Data Sheets and technical papers that treat you like an adult.
 Marineland Aquarium Products: Manufacturers of the H.O.T. Magnum filter, the Emperor Filter, the Bio-Wheel, etc. Informative illustrated sales e-pamphlets, but no instruction manuals.
 O.S.I. Marine Lab: Manufacturers of pellet and flake feeds, etc. Ersatz "Articles" quote their own press releases, as printed in the hobby press.
 Poly-Bio-Marine Inc: Manufacturers of PolyFilter since 1976. Excellent scientific information concerning this alternative to activated carbon or resins for adsorptive "chemical" filtration.
 Python Products:  Manufacturers of the familiar "No-Spill" tank-filler system.
 Seachem Labs:  Sensible information about Flourite, Flourish, pH buffers, etc.
 Tetra: (since 2001 a division of Pfizer) Familiar giant producer of feeds, water control products, book publisher, etc. offers this highly-designed site.
 
(These URLs were checked 5 April 20112)