Yesterday I received 2 medicinal leeches from a lady who didn't want to feed them but didn't want them to starve anymore. They hadn't eaten in 1,5 years. Today I tried feeding them, I placed them on my arm (I know they are disease-free) and one of them latched on just fine but the other one didn't. It barely moves, although it will curl up a little when touched. I have since attempted to motivate it with sugary water and with a drop of my blood but it won't suck and it seems to be moving less and less. Is it too late? What can I do?