if he produces sperm plugs he can breed, that doesn't mean you should. It is not if he will breed that is the issue at that weight it is the health risk to the male, they tend to go off food when breeding and an aggressive breeder could have some serious health ramifications and possibly death. That being said, I have heard of a 300g range male siring a successful clutch but I think a safe range would be in the 500g range. If you can keep him eating and breeding at the same time then that would be the best situation.