Just got a Neo diffuser for my nano tank. OMG I can't believe how good it is. Huge difference from glass diffusers (i even had expensive ADA diffusers in my previous tanks). The bubbles are super tiny and flow is even.
Worth a try if anyone is looking for in tank diffusers.
I loved mine when I had it installed in a 10 gallon. I didn't clean it for the year that I used it, and I didn't see any noticeable difference in output compared to new. The cloud of only micro bubbles that it creates is really nice instead of having random really large bubbles come out like some other diffusers I've used, which is good to not have instantly lost CO2.
Only downside that I've run into is that if it's dry, I have to soak mine in the tank for a while for it to start working properly, something like 3-4 days before attaching Co2 to it.