ok so i went and picked up a bag of potting soil. sand. perlite and two 5gal buckets. mixed 2 parts perlite 2.5 parts sand 2parts potting soil and a tiny but of vermiculite i had left (probably like .25 parts) and a sprinkle of pulverized limestone. i didnt transplant yet because i wanted the soil to dry a bit but when i tested the ph today it was about 6.8. then i scooped some into a cup and watered it and the dropped to like 5.5 and the water is used from my sink tested 6.5 so i dont know what the drop in soil ph from the water. and which one is correct? also just for something to do i tested my tap water and sprinkled a pinch of the pulverized limestone into it and it made the ph drop to right at 5. some now im confused. is the lime stone not the same as just lime? and either way why would it lower the ph and not raise it? i dont want to transplant till i know my soil mix isnt doo doo.