My kingdom for a nice CO2 solution
A good regulator is well worth the effort, same for a needle valve and solenoid.
From there, we can move downstream to a good bubble counter, check valve and then finally to CO2 diffusion.
Each point is critical.
Once in the water, CO2 needs measured somehow or careful eyeballing (fish, plants, algae etc). Riccia seems to do well attached to stones.
Pearls well 1/2 way through the day when CO2 is good. If not, not enough CO2.
If plants are happy, no algae, fish fine, then do not add more.
We can easily mitigate CO2 stress several ways and have much more effective management:
1. Good flow, not enough to break the water's surface but a little less than that is a good rule of green thumb.
2. Good quality CO2 equipment and Gas tanks, needle valve.
3. Effective measurement (harder)- relative measurement once you know what to look for.
4. Less light= less CO2 demand from plants
5. Good filter, routine cleaning, water changes often=> less organic decomposition and O2 draw
6. Reasonable long term fish load (not overstocking)
7. Smaller fish= less O2 than larger say Discus etc requirements (the answer why is obvious, think about it- do not answer PKM! Let them think about it))
8. Good dosing, good feeding of fish
9. Riccia rock, about 1/2 way through the day, the riccia stone will start to pearl well (biotest). This suggests good CO2.
10. Watch the tank, respect CO2, adjust methodically and carefully.
Not quite as simple as it seems.
Sadly, many give it a passing fancy at best.
Guess they know it all with respect to CO2?
Must be nice.