What type of clowns are you thinking? That would be the deciding factor for me. People (myself included) don't usually have luck getting LTA's to host percula/ocellaris clowns. Either carpet or BTA's for those guys. If I had to choose between the BTA or carpet, I would go with the BTA. They aren't so wonderful when they are small, but they are pretty amazing once they mature! Here's a picture of mine:
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