How long hat you had the tank before you set it up.
I had a completely filled 5 gallon tank but held onto it for about 9 months before using it. I went thru it in about 3 weeks, then filled it, set it up and it had run for the past 4 months and still going.
If you filled it and it sat around, open just a crack, it could slowly leak.
I don't remember if it will dissipate on it's own over time, but I know it must have been something for me.
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