I have just started to do this. What I have done so far is to increase his daily amount, due to growth, but instead of dividing the usual 3 meals I have increased the morning and evening meal and reduced the mid day meal. Therefore 150g morn and eve and 50g midday. Next step reduce further till none. Peanut was 5 months when I started this and seems to be coping well with the change, just make sure your viz gets all it needs at other times of the day.