*The problem was solved by Danpost and Vonmeth already, thanks again :) If anyone is interested in how it was solved, because of similiar problems or whatever, here is the link to the discussion http://www.greenfoot.org/topics/2647?notice=Your+post+was+created%21&offset=0

still danpost is right, when I am in the water spots, the seals still can eat me. Its even worse than on the normal field, because i can't see them under the water.