I have a green BTA that I just got about 3 weeks ago. I have a Coralife PC light with two 96 watt 10,000k and two 96 Watt Atinic. ever since I got it, it has daily, almost two times a day, been secreting this brown stuff. It started to loose a little but of color but not that much. I feed it shrimp and it ate it. But Im just worried and is it normal to lost a little color and to secret that brown stuff daily.