Tank, Table.
Instructables user fellc has created this neat Coffee Table, with a fish tank in it. You know I have a think for Coffee Tables, and for DIY projects, hell, even ace fish tanks.
He’s made a 6 step instructable detailing his process. He’s using a 30 gallon tank that he already had, and spent about $350 on the materials building it, the most expensive item was the 2 foot by 4 foot by 3/8 inch thick glass top. He says he’s using plate glass though, that could be a problem, tempered glass would be much better.
While it’s no house-sized aquarium, it’s still pretty ace, specifically because he built it all himself.