Originally Posted by
Garf
No conclusive stuff Shorty, however, several facts are evident;
1) Algae grows better with a bit of Co2, so that energy isn't wasted converting carbonate to Co2.
2) Co2 does diffuse into salt water when the partial gas pressure is above that of the water. Ie if Co2 is being used up, the water becomes more receptive to Co2 ingress.
3) co2 diffuses better with skimmer size bubbles, as diffusion is proportional to surface area.
4) it's possible to reduce water pH in the short term to at least 7.3pH (using a DIY generator) but this is outside the algae tolerance zone in most cases, and could be counterproductive.
5) unused Co2 is almost immediately gassed out.
6) a thin layer of tiny bubbles refracts less light away from the screen than lots of large bubbles.
7) indoor air contains twice the natural levels of Co2 (ish).
8) in my case, ALK depletion is not a problem (with just air bubbles). Maybe using a bit, but may also be my Kalk addition method.
With your reference about a UAS, I have no experience of this. Just hope that some of the above is helpful.