Snails can't be infected by ich, but they could spread it from one tank to another, providing the time frames are right for the parasite to survive. The parasite needs to find a host within around 48 - 55 hours. If there is no fish around within that time frame, then the parasite will die. This also depends on the water temperature. The life cycle that I've mentioned is worked out on water temperatures of around 79F - 80F and above. If the water is cooler then the life cycle can be a lot longer. So quarantining new snails can be just as important as a new fish.
Last edited by escamosa; 09-29-2012 at 09:42 PM.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn. ~Chuck Clark