Well size isn't really a factor for male corns to be able to breed, if they are 18 months old they are ready to breed in my opinion. But if they are not eating or look in bad shape I would wait another year. If your male has been a relatively good eater and is in pretty good shape but say he's only 2 feet long he in my opinion is still able to breed perfectly fine. Just remeber, you should brumate him before breeding.
-Ryan
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-Ryan Noordhoff
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