Clam Opening at Night instead of Day

RobSW1

New member
I just got a 3" Derasa two days ago at the LFS. For some reason it is only opening up at night, and while the lights are on it opens a half inch......

i have it on the bottom of my 29 with a 250w 14k metal halide. could it just be getting used to the lighting? My Crocea is fine so its just this clam....

And i know the Drill (SALIFERT)
Nitrates-2
Phos-und
Cal-450
Alk-9
Temp- 79
SG-1.026
 
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