No, it looks like you've got every thing on your end covered. And beautifully I might add. Keep up the good work.

However, it is bp mating season, where many males' minds stray from warm rat goodness to...you know...
Just keep offering food and checking his weight every so often. Also, I would maybe refrain from handling him until he starts eating again, just in case.

Welcome by the way! There's ton of stuff to learn here although it looks like you already know a ton!