I am new to home colour processing and wanted a bit of information in regards to developing time. Do I need to adjust developing time for different ISO films? I have just completed my first 2 rolls of 400 ISO film and followed the instructions supplied with the kit. do I need to reduce or increase the developing/Bleaching stages for 200/100 ISO film?

I am using a Patterson tank with room for 2 rolls, can I mix different ISO films? For example; Develop 1- 200 ISO with 1- 400 ISO Film?

Any help greatly appreciated!