In the past week, I have added an Atlantic Rock Flower Anemome and a Bi-Color Blenny to my tank. For the past few days, all of my fish (Percula Clown, Purple Firefish and the Blenny) have been breathing VERY rapidly. I did a 25% water change, yesterday, to solve the problem...but, this morning was still the same. What is causing this and what can I do?