WEll then I'm glad to hear that its quite common, I'm not losing my mind over here. I have no one that can do water changes for me. Maybe charcoal in the filter could rid the water of this irritant? Turns out that I do use the Hikari brand frozen worms. My whole body breaks out in hives, arms legs chest back. I do have allergies to avocado and bananna so i know what the symptoms feel like. Extremely uncomfortable but i know that a more serious reaction could take place. Just wearing gloves does not seem like a sufficient barrier, what if i spill onto my legs or shirt? I did suspect the tank de chlor but I had a reaction simply from opening a package and handling the worms. Keep these guys away from your kids!!!!!!