Mine stay fully expanded at all times under 400w M/H. Even after my lights are out they are still mostly expanded to full capacity.
How many T5's and what watts are you running on what size tank?
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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