After attempting to get the best feeding response from my acroporas I have developed a method that seems to work well but needs some fine tuning. Initially I add a small amount of Rod's Foods to the tank with all pumps running. I try to add the smallest particulates to the tank, a type of slurry, so to speak. Wait 30 minutes until I first start to see the mesenterial filaments emerge. Once I see them I add more slurry to the area surrounding the coral. I then wait about 20 more minutes and repeat. It takes much more time for acropora to show a feeding response so you have to be patient. Almost all the acropora in my tank show the response to some degree, except for one tort. The response from the other torts usually happens at night within 24 hours of feeding during the day. Is this a feeding response rather than a defensive one ? I do believe so, because the coloration and growth have improved and I see no adverse effects. I think a lot of people miss it because they do not wait or feed too quickly. If this were a sign of irritation I would expect to see the polyps retract rather then get larger. On occassion the corals will start this response without introduction of food to the tank. It seems that once one starts it, that coral emits some type of chemical response and the others follow. I will admit I have no scientific evidence for any of this, only my personal observations. And I see the greatest response in the smaller frags and much more quickly. This is a frag of a Tri-color valida acropora 20 minutes of introduction of food. One hour later. Two hours later. The Red planet, Green millepora, Christmas millepora, and the Brown stagehorn all 40 minutes after introduction of food.