Well it is more of an imprint then anything correct? An eel doesn't need 30" of height, but the width and length would need to be big. Is there anything you could keep this thing with? If I had, say the correct 400g (96x48x20) could you keep anything with a tess? maybe a large grouper or shark? In a tank that big, like a shark pond, people have huge sharks and groupers, I wonder if they were full grow (3ft) could you keep a tess with them, since the tess shouldn't (I hope) be able to eat a 3ft grouper or shark. I'd just hate to have such a big tank only for one eel, or even fish.