This is a bit out of my realm (Physics, Mathematics) and dabble in sea 
shells.

We have a 300 liter salt water tank with 'live' sand.   What came in the 
sand were
some shells - live and algae eaters at that!  Yea.   Snails tend to over 
propagate themselves.

I also have, and thus my question, some starfish.  These are pinky 
finger nail size or smaller.
They are also 7 legged and gray.
I normally see only 5 legs and Sun (many) legs in books and the web.

Where in the web world is a good site that might help in Identifying 
these wall walkers ?
We have 11 in the tank, for now the number is a who cares.  If they grow 
hand size, they will
be a problem.  I hope to grow them and find new homes.  Knowledge is the 
best friend at this
time.

Martin

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