My pullets are 9 days old now and I am feeding them Dumor 20% starter/grower chick feed. Today I gave them the cut tops off of strawberries. They spent a good 45 minutes chasing each other around eating them. I was told not to give them chick grit until they are older. I'm wondering though if I should give them some grit since I gave them some strawberries? If so, would I just add some to their chick feed or offer it to them in a separate dish?