Discus fish

[tobyk]

I have a 125 gallon aquascape and recently had 11 discus die. I was treating them for 5 days with melafix and pimafix. Didn’t do my normal water changes which I usually do twice a week 25% then add prime. This was skipped this week per the directions on the Medicine bottles. My tank has a CO2 system. So at the end of the 5th day I did a 25% water change. Added the prime and some aquarium salt. Put in a new dose of meds as directed and with in 4 hours 11 of my discus died. Anyone have any clue what may have happened?

[Carl]

This may have affected your Redox balance in a negative way, especially since CO2 can have this affect if not balanced out (though, often in a healthy aquarium the CO2 is naturally balanced out)

Further Reading:
www.americanaquariumproducts.com/Redox_Potential.html

AND:
www.americanaquariumproducts.com/AquariumMedication4.html