after 8 weeks of my tank being fishless... my clown and puffer in a different qt than my tang with the first bout of ich i put them back in the display tank and a week later what do you know my tang has black ich now... i have been in the process of setting up my 75 gal for her to call home. now she has exposed my clown , puffer to black ich. so my question is...... has anyone had any luck with quick cure? and since i read up that the worms live in the sand .. would it be bad of me to just replace the sand when i put them back in to qt? i do know that the puffer cant have meds .. they show no sign of it as of now. so back off to qt they go. ill make sure my tang is in her own qt alone... :cry: