tested my alk this morn, 6.4
no biggie, stability is key.
ur chasing numbers again (not good)
you are set up with auto dosing alk & Ca right?
I was always told to keep 8, 8.5 for alk, but that was hard for my tank for some reason.
7 to 7.3 was where it wanted to run on auto, so I let it be.
u also need the stability with the nutrients, up and down with Po4 is harmful as well.
So set up your GFO and keep it running, only adjust the amount you run if you need to.
feed same amount of food daily, dont increase or skip days.
get a good WC schedule going and stick to it.
Then you'll find out where your tank likes to run for you (it comes from your daily, weekly, monthly husbandry)
Oh, and bring your Mg up. I dont dose Mg with a doser, I check each WC mix and adjust it there. Shoot for 1380 to 1450.