the only thing u have to worry about with the males is if they go off feed, males that are 450g and go off feed can be scarey and u shouldnt give him more than a few days to lock then try to feed again. If he does go off feed i wouldnt breed him any more. The females will go if there ready reguardless of a couple hundred grams in my exsperience and i have bred a 1.5 year old mojo female and she did just fine but she was 1700g at the time