I there i have had theses green button for 2 months or there abouts the first month they were fine then started going down hill they started closeing up and shrinking i have tried moving them around the tank but no change all my water chemestry is fine my lights are double t5 i have posted a couple of pics one close up of one of the buttons which looks like either bleeching or maybe disease of some kind can anyone help in this matter many thanks ......