Sounds to me like your diffuser is leaking.
You can fixit with some silicone sealant but why bother if you can just return it.
A 2 liter bottle is pretty large for a 10Gal tank.
If you have a power filter you can just attach the hose to the glass with a suction cup and let the suction from the intake suck it in and diffuse it thru the impeller in the power filter. This will also help to dissipate some of the extra CO2.
Marcel
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FILSTAR Pimp #2
75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.
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