Looks pretty good. Covering the sides would be a good idea. Also, I didn't see you mention this, so I'm curious if you have an under the tank heating pad for belly heat? As far as the meal size goes, I would definitely say increase the size a bit. That mouse looks pretty small. I feed my 9 month old BP bigger meals than that. You should aim to get a meal that's about the same size as the thickest part of their body, or just a tad bigger. Other than that and the heating pad, everything seems good. Welcome to the addiction!