Moving or just reaching?

Angela2016

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Is this BTA about to move or just reaching for more light? I have a kessil AP700 set at 90% about 12 inches above the water on a 120g tank. It closes completely up at night.
Water parameters are ammonia 0, nitrite 0, nitrates 5, calcium 466. Haven't checked mag or alk.
20160628_181833.jpg
 
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