Aminos help them break down something's burning forget what. Science stuff. All I know is dosing Aminos 10-15 minutes prior to feeding made my SPS and LPS have PE and feeding tentacles extended for feeding more than without. May have been the same response just they were ready for feeding when the food hit rather than, "Oh, there goes the food. Maybe I should try to catch it.". Dinner bell?
This reminds me that I need to get some aminos, at least once I add to my LPS collection (SPS eventually too).