The aquarium? Or the lighting?

You probably meant the latter, but I'll answer both, just because I enjoy talking about aquariums. :P

Okay, first: The lighting is made up of six Grobeam 1000ND LED tiles. They're not cheap, and their spectrum is somewhat bizarre by living room lighting standards; they're tuned to deliver maximum useful light to plants, per watt, not for reading by. It's definitely not black-body.

They perfectly well do work as living-room lights, unless you're a photographer, but you should probably consider other options if you're not trying to grow plants. Cree also makes LED modules designed for wide-angle lighting, which these are not.

The actual aquariums look like this. There are two tanks, each with three tiles, or about 12000 lumens of directional lighting each. It's not quite at the level of daylight, but the amount of light that spills out is already enough to have a noticeable effect, so apparently it doesn't take extreme measures.

I got the tanks from a custom-tank-building outfit here in Ireland, along with about forty kilos of sand and fifty of gravel. The substrate is mostly mud, made using topsoil (gardening shop), kalium chloride (homebrewing website), clay and dolomite (pottery shop), with a thin layer of said sand and gravel on top.

The twisty wood is from a local fish shop. So would the fish be, if there were fish yet.

Lastly, about 1000 liters of tapwater...

If any of you followed me this far, you're probably interested in aquariums. I'd be happy to provide any advice I can, if you want, by private message. :-P