The small air line valves work real well. They plug up after time but they are cheap.  JL has a bag of 6 for about $10 if I remember right.
I use them to drip acclimatize my fish as well.
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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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