i've never treated with copper but i know it's toxic so you must get the levels correct and follow instuctions carefully, the sooner the better, ich is nasty, causes alot of stress, keep the light low as i think that less stressful for them, you must keep the main tank fish free for 6 to 8 weeks to ensure all the ich is dead.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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