if i have a small clown now and want a pair, should i get a small or a big one?

How long have you had it? A clown left without another clown, will eventually turn female, so size isnt always a quarantee of sex. But if its a year or less, you may want to get a large to pair it with. Worst case, you end up with 2 fems, and can get a juvie to add to them to become the male.
 
I recomend you get a larger tank if you want to keep more than one. Or even one.... But i have seen some crazy nano's, that are packed. And it wont take long befor you want a lager tank anyway, its catches like a fever.
 
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