Mark - I don't think I actually have any photos showing the entire tank. Every time I tried they never came out too well because the tank is dimly lit, plus it is extra wide and deep which doesn't help. I've recently acquired quite a powerful flash for my camera, so I'll have to give it a go sometime soon. Here is a shot of one end of the tank, which gives a good idea of height:
And Helen, yes, it is about a million times better than watching the telly. I sit completely transfixed watching them every night!

Emma