diagnostics needed for my baby

About plant:
MG soil
water every 3 days
3 weeks into flowering (its a girl )
under a 150 watts hps light

Problem:

bottom leaves turned yellow and fell off
leafs from middle of the plant have little yellow dots on the outer part of the leaf
the last quarter inch of some of the leafs are dead


other than that the new grouth looks healthy

after i saw this problem i decided it was probley the PH so i tested the PH of the water and it was right around 7-7.2 but i have been using the same water (filtered tap water) since germination without any problems.

So my question is do you think its the PH or nuets? i have stopped giving it neuts for now.

Ps if you do think it is the PH what are ways to lower PH without spending money? lol iM BROKE

leave of nutes for a while i sometimes flush em with ph tested water and wet them through after a week or so get em back on a realy diluted nutes and builed back to normal grow faze good look don.make sure light is right distance from plants might sound stupid but i once had yellowing leaves and didall sorts then i moved light alittle closer and they loved it.good look

A Ph of 7.2 if your medium is soil is a little high. The high end for soil is 7.0. Did you test the soil pH or the runoff pH. If your soil pH is that high then sprinkle dolomite lime to the top portion of the soil. If it is your runoff then always check your water or nutes for the pH prior to introducing it to the plant. The yellow dots it would be best to take a picture and post it so someone can help you diagnose better. Best of luck.

Along with the lime, let your water sit opened for about 24 hours to let the chlorine and other municipal shit dissapate into the air. A small air stone and pump helps during that time as well. Mix your nutes well into the unchlorinated water.

What strength are you using your nutes at? And are they "bloom type" nutes? I would suggest 1/4 strength and see how they react and bump it up 1/4th each time if she's reacting well.

I would just go with unchlorinated water for the next 2 waterings then the nute bloom formula mentioned above.