Fishless definitely allows CO2 without limits.
I'm cycling my new tank, and I'm blasting the CO2 to beat back hair algae.
"So where are the fish?"
CO2 is about 33-38ppm, so not @ nose-bleed levels, but always consistent @ all times.
My wife believes me to be nuts with no fish.
Phishless was decided as a new "handle" basically from her harassment.
Had to add the Ph just to make it strange.
And by the way, your plants are looking very happy and healthy! Nice work and great journal.
Healthy yes, almost all algae ridden stock has now been trimmed away and disposed of.
Trimming can be rough though, many cap breaches for me all the time.
Remember I triple sifted all soil and skimmed all floating debris.
A cap breach only means filter off and a quick little vacuum of affected area.
Never a tank clouded messy holocaust like some have.
I am preparing more dirt to cap a 33 long to replace the 55G.
Same exact mix as described early on in this thread. It works, I ain't changing it.
New tank will be much shorter though, am going to target only 80PAR @ substrate.
Basically it will be a trim tank, small specimens go there before sold or gifted away.