Oh dude don't tempt me.
I have two already and they've outgrown their current abode (40g semi-cube, 24x24x12). The green carpet has already caused me 3 headaches in the last 2 weeks by completely enveloping the overflow for that tank and causing massive overflows. Luckily it doesn't take a whole lot of water on the floor to trip my GFCI's but still I lost 12 gallons in the last spill. The weird thing I only could recover about 2g with the shop vac, and none of it actually made it into the floor drain (you could see where the puddle stopped, about 6" shy of the floor drain). I guess the rest just seeps into the concrete or the cracks in the floor... weird.
I've been thinking I may need to address the need for a bigger tank for the carpets sooner than finishing off my 280g. I kind of don't want to show any current pictures of the 40g because I'm a bit ashamed at how crowded it has become with two 15"-18" diameter anemones in a 24x24 footprint.
This is a picture from 2006 when both carpets were more like 10"-12" in diameter.
Currently what's happening is the green carpet has moved slightly towards the back of the tank, and can lift the eggcrate cover over the overflow (it's pretty ghetto - I know - it's just sitting on top of the overflow). I put a pretty hefty weight over the eggcrate and it can still lift it right up off the glass.