I'm sorry. I assumed you were using a feeder. The one I use is based on time..so that's where the 1 second comes from. As the fish respond, I'll bump the timer to 2 seconds, 3 seconds, and so forth so on based on their response and how much money is available.

It's my way of making sure they don't waste any food.

Hand feeding has to be similar. Maybe begin with 1 cup of food and then increase as you measure their response.

Ephesians 2:10