set up question: min depth

[rickwaines]

I would like to install a sw set up behind the couch. I have a question about tank dimensions. I would like the tank to be 8 feet long. The height can be up to 18 inches or so. The problem dimension is the depth. I can't bring the tank too far into the living room. So, What would be the minimum width of the tank? I would like to keep anemone's and some clown fish.

Thank you in advance. I am a Fresh water guy so please be gentle with me. hahah

Rick