I am a aquaponic beginner here, this morning I did a water test using API 5 in 1 test strips and the result as follow:
PH = 6
I water some yourtube video suggest use egg shell to move PH value up but Calcium seem also affect GH value more
That PH test only displays down to 6, I think, which means your PH may be lower than 6. You could quickly raise a bit by drying egg shells and finely pulverizing or grinding them. You can use a coffee grinder. Add small amounts until you determine how much is needed. Low PH, if too low, can kill your bacteria.
I suggest that you use whatever you have on hand to raise it at least above 6. Egg shells can work quickly if ground finely. Calcium Hydroxide from a garden store will work. If you have baking soda on hand, that's an option.
What I generally use to raise PH is Potassium bicarbonate.
I used egg shell for adjust ph since yesterday now to ph to between 6 and 6.5
Thanks for advising