JHoffpa464@aol.com wrote:
> 
> you can buy instant ocean at any fish store, or ask me i 
> have some for my salt water tank.

OK, but what is it? For lab work you need something known and
reproducible. That means either real sea water (from a region
known not to be unduly polluted) or a synthetic substitute of
declared composition such as the one cited in Roger Moretz's
recent Histonet reply.
  
-------------------------
John A. Kiernan
Department of Anatomy and Cell Biology
The University of Western Ontario
London,   Canada   N6A 5C1
   kiernan@uwo.ca
   http://publish.uwo.ca/~jkiernan/