Developing Tri-x Pan 400 ISO in different conditions

Hi, I am developing Tri-x Pan with Sprint Standard chemicals. Two questions: 1) I took night shots and bumped down my ISO rating to 200. What development time should I use? I should note that I have a 5-roll tank that holds 64 fluid ounces... 2) I want to know if using my 5-roll tank, I should change my developing times? I usually use Tri-X pan at 400 ISo and the table produced by Sprint says that I should develop at 8:30 at 68 degrees? Any suggestions.... Thanks in advance...

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