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I have not, I know the regulator is pretty high quality but I'm afraid that soapy water will get into my tank.
You only need a few drops of soapy water solution on your joints. In addition, I don't see how it would get into your aquarium or CO2 cylinder...
 

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alright, are push fit connections known to leak?
Well, they are designed so that they don't leak, but you never know.

If your high pressure gauge is indicating 900 PSI, your delivery pressure is ~30 PSI, and your needle valve is open (unscrewed, turned counterclockwise) all the way, and yet you still have no gas going into the aquarium, there is probably a leak somewhere (or if you have a solenoid, ensure that it is open and not closed).
 
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