Flatworms do not have any circulatory system, respiratory gills, or an anus. Respiration and food transport occurs by the means of diffusion. This is one of the main reason that they are so flat.
The original and one of the largest list of DIY reef aquarium project links you will find in one place. The large list of links is almost been totally added into the new format, with the number currently (12/01/2006) being 483.
If you have a link to suggest, then please submit it for consideration. Or if you find one that has expired, then please
me so that it can be fixed. You can also let me know what you think of the new format and if there are any improvements that can be made to the way the information is presented.
DIY Links 