Clownfish do this weird movement where they seem to swim down into the floor, are they scratching their gills? Attached is another video to demonstrate breathing rate of clownfish on the right, it seems a bit quick to me. They have just been through 3 rounds of praziquantel treatment 10 days apart (2.5ml/L) for suspected flukes, as they were piping, had faster breathing than shown in the video, head twitching and would not eat. Now there is no more head twitching present, and they eat voraciously.