Yea no problem. I think u can add a lil dolimite lime in or on the soil and that is supposed to keep the ph more stable, but i never have tried doing that
Your gonna start getting some yellowing in week 4 of flower if you havent fed any nutes. The plants have pretty much used all the stuff in the soil. If your looking for something to give the plants the last few weeks i would suggest some calmag and something like maxibloom or maxsea or anything...
Just my opinion but ive used both. My plants veged faster under my 1000w mh/hps lights but the heat they put out was an issue and also my electric bill. I switched to led for that reason. I have to veg about a week longer than the mh/hps light to get the same size but my temps are way easier to...
I topped just once. I wouldve topped more but theyre bushy enough for my liking. Gotta start cleaning out the middle and bottom branches for more sunlight.