I haven't been stung by one, but one day while moving rock one came out and crawled across my hand. Freaked me out a little but was kinda neat. I'd like to know how many are in the tank. I've seen them upto about 10" long, and lately I've been seeing a couple small ones about 3". I'm pretty sure there are at least 8 in the tank. My kids think they are neat, too!!
After watching them in action I think they are a very valuable part of the CUC, they are welcome in my tanks anytime.
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