Be very careful around bloodworms! They're actually highly venomous, resulting in severe allergies. I fed them for years and developed a very bad allergy. I started having severe allergic reactions, took me three of them to realize it was the bloodworms. My eyes swell completely shut, I break out all over in red splotches and can't breathe. It feels like my chest is caving in.. I now carry around an epi pen and an inhaler. I tried just letting my husband feed them, but that didn't work out either. I can't clean our aquarium If they've been fed at all, my hand and arm breaks all out in welps. Also, if my husband gets near me without having washed his hands after feeding I start to react.
The reactions increased in severity.. The first reaction was bad, but the third just plain terrified me. I've always had very bad allergies but I've never experienced anything as scary as my reactions to these things. On the third reaction, it took 3 days for the swelling to go away in my eyes. They were swollen basically completely shut for 24 hours, even after steroid injections. If you do react and experience swelling in your eyes, whatever you do DONT touch your eyes! It will make it a lot worse.