It really depends on why you want a frag tank and how much you want to spend. I don't keep my frag system in the living room, so looks weren't all that important to me. I picked up a 2' X 4' deep hydroponics tray and stand and threw an old sump and spare Tunze skimmer in below it. The return pump is a spare DC6000 I had lying about:
The light was from the hydroponics section in Amazon - that was the 6 X 48" T5HO ($133 daylight bulbs included/actinic and violet ordered separately) - I've put an 8 X 48" T5HO ($175 daylight bulbs included) in since for a shipment of Bali maricultured acros.
The Active Aqua 2x4 Tray Stand w/light Kit SKU:HGSFT24 (this includes the light hanger). Watch your shipping prices, and if it's too expensive to ship try to find one locally.
Look for the Active Aqua Premium White Flood Table 2\' x 4\' SKU:HGFTW24P (it's a deeper than normal flood table). The same goes for shipping with this one as well.
Purchased locally, mine was about $86 for the tray table and $167 for the stand, both of which I could have saved on going through Amazon, including shipping.
The rest was spare parts lying about.
Now, if you're in it to put in the living room, this might not appeal to most folks' general sense of aesthetics. Me, on the other hand...I live with one of those folks... In that case you'd probably want something made out of glass or acrylic.
At any rate, this is a great way of setting up a frag system for holding and moving out frags to family, friends, and neighbors...or in my case, pretty much the eastern side of the state. I swear my turquoise acro was eyeing one of the cats today...
Cheers,
Ray