Now, for my two cents, I think a tank with 8-10 different clowns would look cool!
Now for my experience......I have a 100 gallon frag tank. I had a Snowflake, Black Onyx/Black hybrid, Black Ocellaris, Platinum, and the previously mentioned Picasso. Five mixed clowns, all added at about the same time. Three from the same breeder. After about a month, the Snowflake started to bond with the Onyx/Black hybrid. Picasso is no more. Jeff's out $100. So, my 100 gallon tank now has a divider in it with one pair on each side (ended up getting a pair of Onyx clowns at a swap. Snowflake and her "buddy" are now in a 120.
So, while I think it would look extremely cool. I do not believe it will work in the long term.