I want to point out, btw, that I moved the bowl because he figured it was easier to go under the ramp than over to eat. It's not the kind of behaviour I really want to encourage, because if Comet were to walk on that ramp and Blitzen was under it, I suspect there could be a lot of damage done.
I realise I can't make their housing completely 100% safe, and I can only do so much, but I think it is worth bearing in mind where ramps are concerned. But they love their new home and that's the most important thing.