Unless youre going to eat him, Id stick him on a diet.
(If you are going to eat him, I can recommend a good recipe.)
Otherwise, just start skipping a few days a week feeding, and maybe a feeder or two less than usual on feeding days until he gets back to a healthy weight.
He hit 400g i think the end of june when his was 15-16 months. I think it might be time to start cutting back the food. His crest is now flat on the sides (not concave light a normal veiled) with a little budge coming out the back.
Maybe i should judge him like a solder joint, strait is a process indicator, and convex is a reject.