Changing my workout

It's time to change my workout routine.

Can anyone tell me if there is a reason that I should not do biceps and triceps on the same day?

Right now I do Chest and Back on Monday, Legs and Biceps on Wednesday, and Shoulders and Triceps on Friday, with cardio on Tuesday and Thursday. I want to change that up a bit. I'm also trying to involve yoga each day, or at least every other day.

Any thoughts?

Forgot abs

Oh, I forgot to ad that I do abs following cardio on Tuesdays and Thursdays.