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I actually use hissers for my big T's, I do crush the head so they are not so combative but they do keep thrashing around for quite a while so the T is still interested. I have a tank full of hissers that don't meet color standards and mixed species that I use for feeders and I will sell them cheap, the tank is very crowded and could use thinning down. My email address is on the contact page of my website if you are interested in some.