When I used it, the only item in my tank that appeared distressed was my Hawaiian Featherduster. Feel free to ask others about their results before using this product. The issue is that if many flatworms die at once, their toxins reach lethal levels quickly and this, not the product, can lead to deaths in your tank. Let me add the qualifier that if your tank is heavily infested, Flatworm eXit will not be the cause if you lose livestock. Salifert came out with an excellent product years ago called Flatworm eXit, a poison that only affects flatworms and is reef-safe. Usually a few weeks after you spot these, they will vanish. These are usually opaque, have this distinct shape and do no harm. Image #2 (on the right in this article) is of a benign flatworm. Six Line Wrasses, Leopard Wrasses, Target Mandarins and even Blue Damsels reportedly eat these flatworms, as does one Nudibranch ( Chelidonura varians), but some have opted for a different approach when these methods prove ineffective. If they get to the point of overpopulating the tank, there is the possibility that they may die suddenly all at once, and the toxin they release at death can cause further deaths and even wipe out a tank entirely. Creating a mat with their bodies, they can smother corals or parts of the substrate. They feed on small foods like rotifers, phytoplankton and such, and will grow out of control unchecked. They can move through the tank, elongating the front part of their body like a sail filling with wind, latch on to the nearby surface and pull the rest of its body forward. They appear almost two-dimensional, barely a flap of skin. Due to their extremely thin bodies, they are called flatworms correctly. They may appear on the glass/acrylic, on the substrate, or on live rock. Or you may buy a coral and they'll appear as hitchhikers later. Small reddish-rust colored creatures may already be in your tank.
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