I believe that the entire office should be recused. There is an excellent argument that a Chinese Wall would be insufficient in this case because he is the elected official and head of the office. If the DA does recuse the entire office, a special prosecutor will be brought in from another county. I assume you would like the DA off the case based on your question but, if I am wrong and you want the DA office to handle the case, then no motion needs to be made. Hope this helps.
Assuming the DA doesn't make the motion himself, it's pretty obvious either of the defendants, if they have counsel, will move to disqualify the DA, and a special prosecutor will be appointed.
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