I usually don't ph my water until I have started feeding, but seeing how you already started feeding I would just ph the water to 6.5 anyway, even if you have stopped feeding them. Jmo
lol start feeding week 3-5 or when the plant tellls ya to (yellow lower leaves)
allways ph, water or nuted water
maybe do some more research on here, this site is sooo full of great info & great folks to help ya.
best of luck
start feeding again---use low doses of you nute---maybe start with 1/2 of what they are recommending---that would be 1/2 the nute dose to the same measurement of water---or use a full measurement of nutes and double the measurement of water---what are you using for lighting