I have recently Removed all of my fish from my display tank when some of my fish cam down with Ich. I still have Live Rock, Substrate, crabs, snails and a Cleaner shrimp still in the display tank. Will the ICH die off eventually with no host (fish) to attach to in my display tank? Also how long do I have to wait for this to happen? Can inverts, and also the substrate still carry the ICH parasite even after the waiting period? Then later when I re-introduce the fish back into the main display tank will they get ICH again? I'm worried about re-introducing any more fish in my main display tank and i'm looking for suggestions on what I should do next. Should I remove the inverts and live rock and put them in a tub with a heater and power filter, and remove the water completely and start from Scratch? Please, if you can provide me with any info it would be greatly appreciated!