I'm currently only a couple of weeks into my first tank, so please be gentle.
Firstly I have a Juwel Rio 400 tank (125g) with internal filter system. Due to this I decided to go with pressurised CO2 with a large ceramic diffuser (50mm). In a future tank when I have an external filter system, I will probably go with an inline setup for optimal diffusion, but this isn't possible at the moment.
The CO2 is running at approximately 3 to 4 bps and the drop checker is showing a nice lime green colour - identical, or perhaps a little more lighter green, than the reference. This drop checker is about 1.3m away from the diffuser. It take a while to change but never goes yellow.
Everything appears ok but my question is more about diffusion/spread of the CO2.
The diffuser is directly below the outflow of the filter and this helps blow the tiny bubbles around the tank. The trouble is the bubbles are mainly along the back wall of the tank. The majority slowly rise to the surface and seem to disappear rather than circling the whole tank.
I've tried to make a video to help explain the issue:
I understand it's hard to see on the video but there is a large cloud of tiny bubbles along the back wall but not very many at the front.
Is this a problem for the front plants? Will they not be getting enough CO2? Or do the tiny bubbles actually dissolve into the water and then this water will circulate the tank?
Sorry, I've searched and read many posts but can't seem to find an answer.