Stress weakens a fishes immunity making it easier for a fish to become ill...However, if there is no ick in your tank, your fish will not get the parasite...Pretty simple really..
May I suggest Noga's Fish Disease Book, great reading..You'd be surprised how many parasites and illnesses appear as 'white dots'
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AKA Kim Hardie..
Current Tank Info: 240 gallon FOWLR, 180 gallon reef, 55 gallon for my Dwarf Lion
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