This is, indeed, going to be wall-mounted. Whether a tv-mount will do the trick or not, will be decided after I get an idea of the weight of the whole thing. But there's going to be scaping with fake rock and fake tree/root and there's going to be a pond in the bottom. And the whole thing is over 100 gals...
There's going to be live plants in there and I'm thinking I want to save some energy by mounting the thing beside a window and indeed, make a swiveling stand to be able to turn it towards the window during daylight. An electrician friend was interested in automating it for me.
Possible fauna, if any, is not decided yet. Depends a lot on if I can come up with "doors" for this beast or not.
GRIMM, humble thanks.
And thanks everyone for all the inspiration. I hope to return some.