Obese gerbil

This Ghost. He is approx 3 years old and weights 136g. This time last year he was 110g. Any tips on weight loss? He still runs on his wheel but not as much as he used to. Thinking about cutting down on his seed mix and giving primary pellets.

This Ghost. He is approx 3 years old and weights 136g. This time last year he was 110g. Any tips on weight loss? He still runs on his wheel but not as much as he used to. Thinking about cutting down on his seed mix and giving primary pellets.