Well, I was thinking that he had a breeding tank, so feeding could be done to maximize the growth rate of his shrimp. Personally, I feed my shrimp once a day.
And the tank is 20 gallons with 100 shrimp. Is the tank heavily planted? What filter?
And I'm guessing that 100 cherry shrimp in a 20 gallon would clean up algae in a flash. And as I've read from a discussion here, is that the shrimplets do not survive as well in a planted tank as opposed to a non planted. I'm assuming that his tank is planted, mainly because he is here. So to ensure good survival of the shrimplets, I recommended feeding once a day. Unless you have continued this for a long time and all has been fine, then don't change what it is you are doing. Consistency is important.