My reef tank is now one year old, although in the early days i did introduce a regal tang and within days had the white spot ich. Only one or two fish seem to suffer from it, i managed to get rid of visible signs although the regal tang died. (I have always blamed him for contaminating the tank. Thank god i have had no outbreak or spread of this horrible disease since). I am now probably 6 or 7 months further on with an established and healthy aquarium. My question is, is it safe to introduce a new fish which is prone to white spot if the tank has been free of disease for 6 months and the new fish has been quarantined at the lfs with no signs of trouble, or is it a case of white spot is always present until stress brings it out.

