buying new corals/ how to be safe of ich?

[sterbrock1]

First off your fish don't have ich. Ich is a fresh water parasite:

Cryptocaryon irritans is the salt water equivalent to Ichthyophthirius

Here is some information on it:

What fish are susceptible?
Cryptocaryon irritans has low host specificity (Burgess & Mathews, 1995). This means that it will infect almost any species of fish that is exposed to it, even those that are not native to a marine environment. Saltwater-adapted black mollies Poecilia latipinna were used as the subjects of one trial to establish the low host specificity of this parasite (Yoshinaga & Dickerson, 1994). Resistance becomes increasingly difficult as the population density of the parasite multiplies within an aquarium or system. Infection is more likely in aquariums than in the wild because of high stocking density, favoring the probability of the free-swimming theronts locating a host (Yambot, et al., 2003).

It is evident that different species of boney reef fish have varying degrees of resistance to Cryptocaryon irritans (Colorni & Burgess, 1997. Diggles & Lester, 1996c). In captivity, resistance may be more a matter of differences in the dietary and environmental needs between the various species of fish than any other factor. Species belonging to the angelfish, tang, butterfly, puffer and cowfish families are among those thought to be especially vulnerable to infection. Elasmobranches such as sharks and rayfish are considered to be naturally resistant (Lom, 1984).

Mode of transmission
Cryptocaryon irritans is most frequently introduced into an aquarium when adding new, infected fish into the system (Dickerson & Dawe, 1995). These fish may have the typical white spots or lesions, or they may not exhibit any outwards signs of infection while still harboring trophonts in the gill tissues.

It is possible, but much less likely, to import Cryptocaryon irritans into a system by means other than on infected fish. Water containing the free-swimming (theront) stage is a possible means of introduction (Colorni & Burgess, 1997). However, considering the short time span in which theronts remain infective in the water after hatching this risk is significantly smaller. Storing the water for 24 hours before use should provide a margin of safety (Colorni & Burgess, 1997). Hard surfaces such as sand, rock, glass, equipment and even some invertebrates (invertebrates do not become infected) can serve as attachment sites for tomonts (Burgess, 1992). If any of these objects are removed from an infected tank or system and placed into another aquarium they may carry some tomonts or cysts. It is also theoretically possible to import an infection when using live foods of marine origin.

Drying the aquarium, sand, rock and equipment will kill attached tomonts. Drying, obviously, cannot be used as a means to kill tomonts that are attached to live invertebrates. If the system that an invertebrate, piece of live rock, or live sand originates from is infected, it may be necessary to quarantine these items before they are moved into a display containing fish.

[ThrowinRoost89]

how about you guys **** and get back on topic?

[sterbrock1]

enough said FREED, the ich god!

[Rosseau]

Originally posted by ThrowinRoost89
so if i make shure not to let any of the LFS water get into my tank when transeferring the inverts, i should be good to go?

Finally to answer your question...

"But I only recently understood that the theront can settle out on anything: it doesn't have to be gravel or a stone at the bottom: it can be a leaf or a speck of detritus. In this way Ich can be introduced with new plants taken from an infested aquarium, a vector that could easily give the appearance of spontaneous generation of Ich in an aquarium: the Myth That Will Not Die. You can only be sure this won't happen, if there are no fish in the tank your plants came from."