What the heck is 'ick,' anyway?

I believe it's some type of fungus, they get pretty ill from it. Can kill the whole tank, if untreated, it's as simple as going to the pet store, you may want to take a sample of the water with you. But it is sort of like white stuff that grows over the fish. Hope you catch it early enough!

I found a website on Ich:
Click Here
Also, after researching I think at the pet shop you can get Jungle Ick Guard to treat it.

Oh, I don't have ich. I don't even have fish. I was just wondering what it is. Thank you!

Ick is a fungus that is caused by stress of the fish ether by bringing it home from the pet store or getting scared. Hope that helps!

According to soaringhorse's link, it's a protozoan (single-celled animal), not a fungus.

BONUS: Both ICH and ICK are acceptable Scrabble words.