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[APD] Leaves folding up early

Why would the majority of my stem plants start folding in their leaves
well before lights out.  H. polysperma, R. rotundifolia, L. repens...
they all seem to start "shutting down" before the end of the
photoperiod.  Typically, after around 10 hours they start closing up.
I follow a regular dosing schedule, and none of my plants have any signs
of nutrient deficiencies....
This is a standard 75 gallon tank with pressurized CO2 and four 55 watt
compact fluorescent bulbs.
Looking forward to your comments
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