Since no one mentioned it, I thought I might. A 90 is too small long term for a Yellow tang and DEFINITELY too small for a sailfin.
Tangs in general are better suited for established tanks, not one just set up. You've mentioned a few times that this is a new tank...and yes, only being up a few months is new. The tank isn't 'established' until a year or so in.
Next, you came here asking for advice about the fish but had no intention on listening to what you received. You knew from the moment you first posted the thread that you were buying the fish, so why even ask? You have a new tank with 3 chromis in it and wanted to add 2 bio load machines and multiple people told you that you might want to wait. Your only response was to ask not to go off topic.
To answer your original question, the yellow and kole should get along. BUT the yellow CAN be a bully. AND the tank will be too small for the yellow shortly. If they make it through the re-cycle.