get you a ph pen the only way to go. and get your ph up to 6.3 and keep it there. get you some ph down and ph up to adjust it. you can use bakeing soda for ph up, and lemon juice in a ph down. but i use ph down from the hydro store. and use baking soda for my up.
I use the stuff for PHing Hot tubs, you can find that in the hardware store, up and down.