A few recipe's here for preparing artificial sea water at home.
Need your inputs here to check if these are sufficient.
http://www.stanford.edu/~erlee/seament/smp_swat.htm
A Japanese website with the formula they used for raising fish and inverts... While the chemical names are in english, the text explaining how to actually prepare the mix is in Japanese
http://web-mcb.agr.ehime-u.ac.jp/marine/feeding/makeasw.htm
Do let me know your thoughts.
Vidul