Dude, yours is working WAY better than mine, now I know something is wrong...
I can't tell how fine your bubbles are but considering i'm looking at a 5000 they are probably much smaller than mine... I was told to soak the diffuser in bleach but I don't see how that is going to help with the large bubbles coming out of it.
My other one is now showing the same problem, but it is a mix of large and small bubbles. at least there are SOME fine bubbles coming out but I'd say probably less than 40% of the CO2 is diffusing...
I may just switch back to the red seas diffusers, I think these ceramic POS's are over rated.