Which clownfish speice will normally host in a BTA?

Not sure what you mean by "normally". If you mean, in the wild, then all clowns except the skunk clowns and the percula/ocellaris clowns.

If you mean which ones will normally go into BTAs in aquariums, then it would be all clowns. Perculas and ocellaris are sometimes a little slow to figure it out, but "normally" they eventually go in.
 
I believe BTA's are natural hosts for maroon clowns and several others. My oscellaris' took too their RBTA rather quickly, but that can never be guaranteed.
 
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