Yes rdebonis, warmer water= less oxygen. Ship in insulated containers with cooling packs and you should be good to go. As far as adding anything to the water, well, I've seen some tablets that you can add to the water that would calm the fish and increase oxygen, but don't remember where I've see those. Maybe AES.
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There comes a time in this hobby when it's just cheaper to silicone around the windows. 
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