After installing a UP CO2 Inline Diffuser on one of my tanks yesterday i seem to be having a problem controling the co2 via the needle valve, it goes from a steady flow of bubbles in the bubble counter for a few seconds followed by a big burst of bubbles and then back again, the diffusor has been running fine for over a year unless it coincedently has gone up the spout just as i upgraded the diffusor but it seems unlikely, Has anyone else experienced this with the UP CO2 Inline Diffuser? or do you have any ideas what it could be?