Thanks again for everyones help. Everything is going very well so far

By now the TA dropped to 110ppm.
Values from this morning:
FC 4.5ppm
CC 0.4ppm
PH 7.6
TA 110ppm
CH 275ppm
I ran out of acid 2 days ago so I turned off the waterfall. 2 days ago the PH was at 7.8 today it is 7.6 does that mean if I don't run the waterfall the PH will decrease? My assumption was it would stay about the same.
Do I need to SLAM because of the cc? hard to tell if it's .2 or .4ppm