Links
I have visited and used alot of Aquatic retailers on and off line over the years, some have been good and some not so good. Below are three that are highly recommended (Not in any order of preferrance).
Recommendations
Pier Aquatics 
Pier Aquatics in Wigan, Lancashire offers excellent advice, clean tanks, healthy fish and very reasonable prices. They house a very large selection of Cold, Tropical and Marine Fish amongst others like Stingrays and rare Catfish. They also have an excellent selection of imported Malawi Cichlids, which sometimes include those rare and hard to find genus.
Pier Aquatics, Wigan Pier,
Great George Street, Off Wallgate, Wigan, Lancashire, WN3 4DL
Tel: 01942 236661,
Fax: 01942 82 10 53,
Contact: Neil Woodward
Tri-Mar
One of the U.K.s Leading suppliers of Tropical, Coldwater, Marine Fish and Invertebrates. Voted "TOP 5" UK tropical Fish Shops & best shop in the south offers next day fish delivery service.
Tri-Mar, Pendarves Street,
Tuckingmill, Camborne, Cornwall, United Kingdom, TR14 8NP
Tel: (01209) 713639, Fax: (01209) 713647
Contact: monty(AT)trimar.co.uk
Poseidon's Palace
As a keen aquarist for the last 20+ years I thought it was about time that I put some of my experience to use, and if possible pass it on to those less experienced.
I also decided that it was about time that I started making my own aquariums as paying shop prices was out of the question, I have since found a glass supplier that can provide me with the glass at a rate cheap enough to manufacture for other people.
Keighley, West Yorkshire
Tel: 07792 925465
Contact: jez(AT)poseidons-palace.co.uk
Aquatics Online UK
Aquarium, Pond & water gardening equipment specialist. Your one stop online shop for all your Aquatic products... from a single Aquarium airstone to a complete pond filter system. You will find it all in their online catalogue, not to mention super fast delivery.
Information Websites
An organization devoted to halting the barbaric process of injecting ornamental Tropical Fish.
Fish Link Central - Your Guide to Aquarium Resourceson the Internet.
http://fishlinkcentral.com/
Tropical Fish Finder - Tropical fish finder provides two information services.
http://www.tropicalfishfinder.co.uk/default.asp
The ultimate apple snail website - Everything you need to know about apple snails.
http://www.applesnail.net/
Tetra UK - Tetra is the leading manufacturer of fish foods, treatments, equipment, air pumps, aquarium filters, pond pumps and liner, and fish care products for goldfish, pond fish and tropical aquariums. Tetra are experts in making fishkeeping easy.
http://www.tetra-fish.co.uk/
End Tropical Fish Cruelty - Please sign this petition and put a stop to the barbaric and cruel hand painting of certain species of tropical fish.
info available with petition.
http://www.petitiononline.com/fishtank/petition.html
The Age of Aquariums - The most entertaining international aquarium site on the net.
http://www.aquahobby.com/main.html
Rainbowfishes - A web site dedicated to the Rainbowfishes of Australia and New Guinea.
http://members.optushome.com.au/chelmon/
Rainbowfish Online Magazine - The Online Magazine Dedicated to the Rainbowfish Enthusiast.
http://pandora.nla.gov.au/nph-arch/O1998-Jan-20/http://www.ecn.net.au/~atappin/articles.htm
Apistogramma.com - Apistogramma.com is, in no small way, quite a different site now. Much effort is going into making it an even better resource for the perpetuation of information about Dwarf Cichlids.
http://www.apistogramma.com/cms/
Virtual Fishtank - Build-Your-Own-Fish online.
http://www.virtualfishtank.com/main.html
Planet Catfish - The biggest catfish reference site available.
http://www.planetcatfish.com/core/index.php
Cichlid Forum - With over 280 illustrated cichlid articles, 3,000 photos, 60,000 members, and millions of hits a week this is truly the Internet's largest and most popular cichlid resource. 
Loaches On Line - The best source for information on loaches.
http://www.loaches.com/
The Cichlid Room Companion - Center for information about Cichlidae.
http://cichlidae.com/
Fish Base - Practically all fish species known to science.
http://www.fishbase.org/home.htm
The Tropical Tank - Here you will find lots of information on Tropical Fish and Aquariums.
http://www.tropicaltank.com/
Malawi Mayhem - Exciting new Lake Malawi African Cichlid website.
http://www.malawimayhem.com/
Tropical Fish Center - Tropical Fish Center and Forum.
http://www.tropicalfishcentre.co.uk/
Fins - The Fish Information Service.
http://fins.actwin.com/
Shops
Atlantic Aquatics - Your No.1 Marine Reef Fish, Tropical Fish, Reptile and Pond Specialist.
Classifieds - UK only Aquarist Classified Adverts.
http://www.aquarist-classifieds.co.uk
Aquarama - We are based at Aquarama House, Aquarama, 40 Bedford Street, Barrowford, Nelson, Lancs, BB9 6DA.
http://aquarama.co.uk/
Oasis Aquarium - With nearly 200 aquariums of healthy tropical. marine and pond fish and plants coupled with 3 floors of all thats best in the aquarium hobby we are sure that however far you travel you're certain to be impressed by your visit.
http://www.oasisaquarium.co.uk/
Urmston Aquatics - Quality products at a competitive price: It is always our aim to supply quality products with a high functional value at a competitive price.
http://www.urmstonaquatics.com/
Fish and Fins - Fish and Fins ltd UK have been supplying Aquariums and aquarium supplies and garden pond equipment online mail order to your home or business for over 2 years.
http://www.fishandfins.co.uk/index.htm
Aquatics Warehouse - Aquarium supplies, pond liners, pumps, filters for pond supplies, marine and equipment. Butyl Pond Liner, all supplies at low low prices.
http://www.aquatics-warehouse.co.uk/
Wharfaquatics - Specialising in Rare and Exotic Fish, Custom Built Aquaria and Filtration Systems.
http://www.wharfaquatics.co.uk/index.htm
African Aquatics - African aquatics are direct importers of Rift Lake cichlids and rare synodontis catfish.
http://www.africanaquatic.com/index.php?main_page=index
Aquascope - Full range of tropical, marine and cold water fish. Aquariums made to order.
http://www.aquascope.co.uk/
Aquamania - The largest aquatic, pet and fishing tackle superstore in the north west. Stockist of all leading brand products.
http://www.aquamania.co.uk
Aquascape Fish Imports (trade) - Distributors of tropical, cold water, marine fish and inverts to the aquatic trade.
http://www.aquascape.co.uk
Quality Koi Company - The UK's most popular Koi Store invites you to browse a vast range of handpicked Koi and accessories. We also stock tropical and coldwater fish.
http://www.koisuppliers.com/main.html
