I suppose one could put the external CO2 mister in plain sight inside the stand along with a bubble counter and check vaalve. In my new setup that is where I plan to have it, all in the cabinet.

Let us know how well the external CO2 diffuser works Tom.

I saw a post on the PLanted Tank about somebody in Oregon selling the Rhinox glass diffusers for cheaper than Aquatic Magic.

I think it would be nice to have some precision KH reference solution availiable to buy as well.