The only Ich I've seen was in a quarantine tank and the fish was treated. Had I not quarantined that fish, I most certainly would have exposed my Display fish to the parasite. Does it exist in every tank? I'm not expert enough to comment. I only know I've never seen any symptoms in four years of reefing. My fish survived parasite free through two upgrades, which means they went through very stressful situations at least twice with no trace of Ich.
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"You can't learn this hobby one question at a time." (Mr. Tuskfish)
Eileen
Current Tank Info: I'm out of the hobby, but used to have a60 gal. reef, refugium in sump, Internal Mag 9 return, SC 302 skimmer, two Maxi-Jet 1200's modded, four bulb T5 Lighting, Reefkeeper Lite Controller with three PC4's, Little Fishes GFO reactor.
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