CO2 and Discus
I have had problems with poisoning Discus with CO2. I have a forced CO2 system with regulator and digital PH meter. Recently I did a big cutback of plants, but did not cut back on the co2 approx .5-1 bps). My Discus all died at once, but the Apistos all lived.
I tested the CO2 (PH and KH scale) and it had spiked the same day. I assume my PH meter didnt catch the ph change and shut down the regulator until it was too late. Is the answer as hands on as turning the CO2 way down and gradually raising it as I test over the course of days? Should I have had the GH higher before to stabilize the PH? What is the best solution to keep this from happening again. It was tragic!
Now the reduced fish load is causing NO3 and algae issues (I tested it recently at 1 ppm and have been dosing No3 to get it up).
My usual numbers are
NO3 - 4 ppm avg
PO4 - 1-2ppm avg
CO2 4-12 ppm avg
KH 2-4 avg
GH 3-8 avg
Any suggestions would be very helpful.