Hello there,
I have 3 couples of discus who made eggs in my tank, but none of them never ended-up having wrigglers. The eggs look dead afer 3 days, white opaque.
My PH is at 7 and I wonder if this is the cause of the eggs to die.

Should I go with Co2 to lower the PH? If so how big of a Co2 system should I go for a 400L, or a breeding 100L tank?

Thanks!