Hasta La Motion!

this is my first time to open the post. I have a question about rendering. you can see the picture there have so many place was dark. Even i set a high reflection or reaction or shadow rays etc.. the result also is it.. so how can i solve this problem . . the water was made by realflow. so there have many polygon.. pls help me..thank you so much

i tried to use the texture of dielec_material, blinn, mia_dielec_material.. sorry i dont know why i cannot upload.. so pls click it to see.its safe

http://www.go2upload.com/viewpic/2/b97ccf.html
http://www.go2upload.com/viewpic/2/cea66e.html
http://www.go2upload.com/viewpic/2/4e019f.html