About six weeks ago, i bought my friend's ray. two female and one male. his tank was elevated and eye-leveled. I transferred it to my tank which is over-looking. The problem is from day one up to this day, every time i do my daily routine such as feeding or even doing my water change (twice a week), the male ray will run around the tank then curl his whole body. sometimes the curling takes a few minutes, sometimes few seconds. my observation was if there is a movement near the tank, the male ray will be frightened then curls his disc. The male eats a bit well, and his body is in good condition. what should i do to help him adjust? should i add more rays? please give me your informative thoughts. thanks=)