I would contact the seedbank which you purchased these from and also contact the breeder (barneys farm) and explain what has happened. A germination rate of 33% (1/3 seeds) is not acceptable by any standards - not only this but the only seed that you have left turned out to be a hermie, also not acceptable by growers standards! 
I'm 110% sure the seedbank and breeder are more than willing to help you out here (so long as you write a nice email/contact to them and are not rude). The problem with hermies is that not only will the male flowers grow where you can just pick them off, but they will grow INSIDE the bud itself, which is a real problem as seedy bud is generally bad, not always though, but it's something I personally wouldn't smoke at all.
So yeah, contact the seedbank and breeder and you should be good to go and see if they can send out more seeds to you; in the meantime continue growing your existing plant and remove any male flowers.
Hope all goes well! :Sharing One:
I'm 110% sure the seedbank and breeder are more than willing to help you out here (so long as you write a nice email/contact to them and are not rude). The problem with hermies is that not only will the male flowers grow where you can just pick them off, but they will grow INSIDE the bud itself, which is a real problem as seedy bud is generally bad, not always though, but it's something I personally wouldn't smoke at all.
So yeah, contact the seedbank and breeder and you should be good to go and see if they can send out more seeds to you; in the meantime continue growing your existing plant and remove any male flowers.
Hope all goes well! :Sharing One: