Dugesias tigrina question  4/29/06 Hi I had a lab experiment with Dugesias tigrina. I cut their heads off and two weeks later they regenerated. Now I brought them home and am not sure how I can take care of them. Should I feed them Chicken and egg yolks? How often should I change their water? <Mmm, this is the world's largest free-living flatworm... Please read here: http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2004-43,GGLD:en&q=Dugesias+tigrina I am unfamiliar with the culture of this Platyhelminth. Bob Fenner>

Polyclad flatworm question Hey guys, <howdy do?> Let me first thank you all for the hard work you've put into the site. Having only five weeks into the hobby, the information has proven invaluable in both the months before and weeks after setting up my tank. Especially so in helping me selecting appropriate livestock for my skill level and biotope I am attempting to humbly mimic. <please keep learning and sharing> So, that being said, I noticed two weeks ago a Polyclad flatworm played stow-away in a chunk of Fiji liverock. I've had a dickens of a time trying to find a match in any of the websites or invertebrate books I've consulted. Unfortunately for me, I don't own a digital camera to send you a picture. The worm is fairly large, about 3.5 inches long and elliptical in shape. The front of the worm is about 1.5inches wide which tapers to about .75-1.0 inches at the back. The worm is a translucent white with brown spots reminiscent of a leopard skin pattern.  <sounds quite beautiful> The center of the worm (digestive track?) is solid brown. It seems to be mostly reclusive and diurnal. I'm not so concerned of making a species identification, but rather if it can pose a toxic threat. <doesn't sound colorful enough to be likely/very toxic> None of the livestock in the tank has bothered it, nor have I seen it go after any fauna in the tank, including sessile invertebrates of the visible type (since it rarely stops in any one place, I am wondering if I even have the proper micro fauna established for it to feed on). <exactly... even as harmless, it is unlikely that you will have correct/enough food to support it. Good or bad> I'd rather leave the flatworm in there and enjoy the brief glimpses I can snatch of it,  <agreed> but if it can pose a threat to the health of the tank (including its inevitable demise), I'll attempt an extraction. <small risk, IMO leave it in peace and watch closely in the meantime> Thanks in advance for your assistance, Brian Rice <best regards, Anthony>