ICH!!!!!

[mrhasan]

Not sure but here's another line:

"Most wild fish are exposed to low levels of this parasite but are able to effectively fight off the infection without becoming seriously ill. In contrast, due to a relatively small volume of water and a concentrated population of fish, the number of Cryptocaryon has the opportunity to explode in the home aquarium."

[Aquattro]

Yes, I think that's well known. What are you trying to determine?