So I am growing outdoors in 10 Liter pots with sunshine mix 4 and some worm castings. They Are about a month and a half old now and the weather started to get nicer finally and decided to give them BioThrive and cal mag once every four days. Did that for about 2 weeks then noticed leaves were turning yellow and brown. So I flushed them out and didnt give them the ferts for about 10 days. Then I checked my ph level of my water and ferts when together and its 4. What can I do to make it around 6.5 - 7? change from biothrive ? or can I add something to mix with the biothrive? Thanks