I e-mailed them and Mark Martin responded and answered all of my questions, sounds like a great guy and a great company. He says these eels make really great captive animals and are easy to care for, and that one would be very happy in the 240 I just bought. So I think I'm going to go for it. He mentioned he has some medium-sized sub-adults available, and when I asked him what the adaptability differences are between juveniles and adults, he said he prefers larger animals because they've proven that they are able to be self-sufficient in the wild long enough to attain that size, so they are obviously healthy and hardy with good hunting skills and immune systems, thus making captive success pretty much guaranteed. Gotta get the tank up and going!!!!