Well sure I guess so but I do not believe I have had a tank since the 80s that has not had ick introduced into it. I will stick with my no OT hasn't doomed me yetich does get them, thats how it is brought into our aquariums. It is quite a bit easier to live with encountering 1 ich per 100,000,000 gallons than swimming in an aquarium with hundreds to thousands of ich per gallon. That would be like getting stung by 1 bee vs an entire angry hive of bees. Very different outcomes.