<a href=showthread.php?s=&postid=12848946#post12848946 target=_blank>Originally posted</a> by Slakker
If adding to an established system containing fish, it should be cured/quarantined for a period of at least 4 weeks. C. Irritans (the parasite responsible for ich) can be found alive on substrates (rock, sand, snail shells, stony corals, pretty much anything wet) in the encysted Tomont phase for up to, and on occasion over, 28 days.