<a href=showthread.php?s=&postid=11321152#post11321152 target=_blank>Originally posted</a> by Freed
Waxy, how can live rock not live without ich? Please understand that ich IS NOT always in anyone's system and can be easily kept from entering a tank. QT will ensure you don't have ich in your system.
Some things to ponder from the "experts"
"Ick/Ich is always present in your tank, in your fish. Stress is the main cause of Ick/Ich. Your fish can get stressed as a result of many things. I have found that Ick/Ich seems to show up most often when I add new fish to the tank. Almost every time I bring a fish home from the store and add them to a tank within a few days not only does the new fish develop Ick/Ich, but several of the other fish as well. Very frustrating."
"Ich is short for the name of a ciliated protozoan of the genus Ichthyophthirius. Ich is usually present all the time in aquaria in small numbers, just like germs are in the air we breathe. However, when a fish suffers from extreme stress, such as a sudden drop in temperature, its resistance is lowered and it becomes vulnerable to diseases. Ich outbreaks also occur after the introduction of new fish to an established aquarium.
Ich is free-swimming until it attaches itself to the skin of a fish. Under a microscope, the organism is easily seen and identified, even under low magnification. It looks like a round, rolling mass. According to John Gratsbek, et al, in the book Aquariology, The Science of Fish Health Management (Tetra Press), ich is one of the few fish parasites completely surrounded by cilia. The organism's U-shaped nucleus is often visible under a microscope.
Once the free-swimming ich reaches a fish, it attaches to the outer layer of the skin of the host fish. The ich organism then forms a tough outer shell, or cyst, while it feeds on the fish's bodily fluids. This encysted stage, called a theront, grows large enough to be seen with the naked eye. Each theront appears as a tiny white spot on the fish. Severe ich infestations make fish appear as if they are covered with salt. After the theronts grow to a certain size, they break through the skin and drop off the fish. As they fall, they attach to the bottom or sides of the aquarium, or to plants, gravel, decorations, tubing or any other stationary object. Theronts then begin their reproductive stage, and are then called a trophozoite, also known as a trophont. The attached trophozoites then begin producing the infective, free-swimming stage. Hundreds more free-swimming ich organisms, called tomites, can arise in less than a day and a half, and they in turn re-infect the fish in your aquarium."
This is why it might be found on your live rock...