Most people recommend at least 600 grams, but I heard of one person (don't remember who) that was successful at 200 grams. I think a picture of it is floating around some where. The big factor I think is the age. If the male is too small/young he may not be interested in that type of activity. We are currently trying to get our Pastel het Albino up to wait for a late breeding this year with a normal, but we figure we will do three on with him then give our normal male who is already close to 600 grams 3 days then go back and forth. If we get patels we know who was active!