I recently purchased 4 new seahorses from Ocean Rider and added them to my tank. Before they arrived the tank had some soft corals, some zoanthid corals, and some mushroom corals. Also it's important to note, the tank already had a pair of seahorses. Since adding the new Seahorses most is not all of the polyps have been retracted and the finger leathers have shrunk into the defensive form.
I believe it is in response to the new seahorse's grabbing them over and over, since I cannot find anything wrong with the water parameters / the overall tank appears to be healthy.
My question is, if anyone has had a similar effect after adding a bunch of new Seahorses to a tank and if the assumption above is reasonable. Also, if so will the corals eventually learn to ignore the Seahorses in time / should I be worried about the health of the corals as a result?