Sea Anemones fight over territory. The red Beadlet Anemone, Actinia equina uses its acrorhagi (blue beads) and the green Snakelocks Anemone, Anemonia viridis uses its long tentacles. 

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Further Information:

Ref:  Manuel (1981): British Anthozoa.
ISBN 0-12-470050-0  (Academic Press) 

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Biomar
British Sea Anemones

British Anthozoa

Up until now there has not been a colour photographic guide to these most attractive animals in British seas. The standard literature was British Anthozoa by R L Manuel  (Academic Press: Synopsis of British Fauna series) ISBN 0.12.470050.0 This is the 1981 edition. I think a later edition was produced. It contains the accurate line drawings.

The Biomar CD-ROM rectifies this shortfall, and the section on the sea anemones is reason enough for acquiring this CD-ROM. 
(I found the sea anemones the prompt that got me interested in marine life around Britain: a compulsion at the time.)

Almost all the sea anemones found around the British Isles are illustrated by superb photographs and a brief explanation about the anemones and other anthozoans. These include rare and uncommon species that I have never seen in the wild or even in photographs before. 

Addenda (2005):

Guide to Sea Anemones and Corals Of Britain and Ireland
by Chris Wood

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Habitats:

Submerged Cea Caves (JNCC)
 

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Book Hunt

Cnidaria Web Site (World)