How much grain + how much water are you using before pouring into your 5-gallon bucket?
By the way, just remember that chickens are omnivorous and will do better if they have some animal type protein in their diet as well.
Here is a link that might interest you - http://www.themodernhomestead.us/article/Sprouting.html
I've been wanting to do what he does but I am only just now getting to a point where I can try it.
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I just put as much grain as I can in my 5 gal. bucket and leave space at the top for swelling of the feed/grains and then submerse it all in the water, leaving about 3-5 in. of water above the grain line.
I let the chickens provide their own animal proteins as they free range and forage all day long, then feed them my feed supplement in the evening. I did this with meat chickens and used to do it with layers but my focus has changed and, in the future, I will try to develop laying birds who thrive and produce primarily on their own forage and will only supplement this in winter months.