I am making a 3-tier cake.  I want to cover the middle tier in fondant and cover the other tiers in buttercream.  Has anyone ever done that with multiple tiers?  Would it look weird to have two buttercreams and one fondant?  The middle tier is going to be red, and it's easier to buy ready-made red fondant than to create the right red in buttercream.  That's the only reason I want to use fondant on that one.  Thank you in advance for your thoughts!

idk -- it just depends on how the total decor goes-- it could go either way--

like if there was enough red fondant decor on the buttercream tiers and enough buttercream design on the red fondant tier it could look awesome--like positive negative--however if you are not confident to make red buttercream icing -- i'm unsure as to how you would succeed -- i mean red icing is pretty basic cake deco--

if that is your only reason i'd encourage you to learn to make red buttercream first -- then decide on your design choices 

best to you