Try taking a look at the sticky's...they're very helpful.
Also this website:
http://stingraysource.com/StingraySource/dreamline/index.htm
and this book:
http://www.amazon.com/Freshwater-Stingrays-America-AQUALOG-Special/dp/3931702871/ref=pd_bxgy_b_img_c
Also this website:
http://stingraysource.com/StingraySource/dreamline/index.htm
and this book:
http://www.amazon.com/Freshwater-Stingrays-America-AQUALOG-Special/dp/3931702871/ref=pd_bxgy_b_img_c