I've had good luck with Aqua Medic regulators and Aqualine-Bushke M-Ventil solenoid.
The needle valve on the regulator sets a working presssure of between 1-2 BAR and I use a Red Sea needle valve to adjust the bubble rate.
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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