i just my well water ppm about once a month,when the aqufier receives a little rain from up stream,it usally goes up about a point then level back after a few days,rain water i dont even bother checking,i use tea every other feeding,when i feed i use KNF nutrients i make myself,but no i never check ph or ppm the soil employees take care all that hahah,if you have some really good living soil it take anything you throw at it just about,that being said i have no idea what your feeding,if the nutes come from a manufacture and in bottles just do as you would regluar and drop to half dose and work your way up to you get to the plant sweet spot,also just a tip be inside or outside,if your leaves are praying to the sun they need feed,if they just look as they always have dont feed,i grow outside veggie gardens mainly,im down on the meds growing ,i have all i need for another 4 months,but you as i always starring a hole threw the plants so you know what they normally look like,then all a sudden they look pretty and perky,they need water cause next day they be drooping most times,i mention this method mainly because outside it not normal for a perky tittie plant,real easy to over water and that bring grubs and all kinds critters tom your door step,biggest tip of all,dont go by your schedule of feeding ,go by plant talks,they all dont just feed the same ,some take boco of nutrients from the soil others are slower and hog out closer to the end game ,by feeding the plant when it needs it keeps a ton of larvae from surviving in your soil,wet soil brings on madness,all these pics of yellow strips hanging and or on the top of a pot,is usally from over feeding,especially knats they thrive with moisture,some say it came from the dealer direct in bag soil,never had that issue but some do,keep that soil damp and make there ass pray to the light or sun and you see them buggers be gone,hope it help friend,im sure others will follow with trash talk or which ever but make your own choice,unfortunatly we learn from mistakes but all is life experience