I use sinking pellets. I feed them in the morning the same time each day. Each morning they are there waiting on the same rock at the top to be fed. Took about 3 weeks for them to lean where to wait. At first they didn't eat, now they eat so much you would be amazed! I choose to manually feed them using a small squirt bottle with an extention tube because the fish grab the food before it gets to them and it's fun to watch them attack the food.
Updated. WOW. I just looked at the shrimp. I feed them well. After a molt one shrimp really grew!!! Power feeding makes them grow fast! I probably should reduce their food a bit.