It is always better when treating fish diseases to quarantine the fish so that you don't have negative effects on your other aquarium inhabitants. Especially with something like ich that requires a fish host. If you leave your tank fallow (without fish) for the 6 weeks and quarantine and treat your fish separately, you will be able to return your fish to your display tank, have no more ich, and not harm your inverts and other animals in your display. This is especially necessary with carpet anemones, which are more demanding than other types. There really is no "easiest to care type" of carpet. hth.