Lack of CO2

I just found out that my current CO2 diffusor/reactor is not effective and my helferi is turning brown. I quickly change my CO2 reactor from the current one to the old 5 bioballs connected to a powerhead. By the next day, some of my other plants seems to be bubbling. Hope my helferi will recover from this lack of CO2 condition.

Updates on my planted tank. Cleared away some java moss.