Do you have a history with the female? When did she lay last? Is she at the point where she must be bred now, otherwise she has to wait til next year?

If she laid in the summer/fall, then you likely have time to grow him bigger. if she is ready to breed right now, I'd put the mocha with her and wait on potions for next year. In any case, i would at least wait til he's up to 400 grams.

Good luck!