Any info or advice would be greatly appreciated to solve this problem. I used to be able to breed discus when I lived in a major city and now I have moved to a small town with a deferent water system. It is is reverse os.mosis and the tds is around 25 from the tap. It has been 2 years now and Im cant even get my discus to pair off, you would think this is perfect water. I have tried everything raising temp, deferent food,water changes. I recently purchased a few young pairs and when I brought them home they started cleaning the cones but now have stopped and show no interest.,I have a total of 24 discus so some must pair and lay eggs. I should note that I have angles as well and have absolutely no problems breeding them in this water. Is it possible the tds is to low. Thank you for your comments