Whats wrong with my plants? bottom leaves turning color and dieing. PLEASE HELP ASAP

Ok well i cannot figure out with wrong with my plant so maybe ya can help. Im a first time grower so im sorta inexperience.

Im using miracle grow. I read its not the best for marijuana but i got it for free

I think its called CFL lights not sure. Its the one that are twisted, daylight. i got 3 100 watt bulb running.

Usually runs around 75-80 degrees depending on day.

I usually water once a day with faucet water

Not sure about ph levels. Sorta new to growing so i have no idea what that is.

The problem started with lower leaves but seem like its spreading to the top leaves one by one slowly.

There about 4 weeks old.

I look for bugs, but havent seen any on them.


Here some pics please help. Because this marijuana is for me and it will suck if i waited this long for plants to die.
So thanks.

long story short nute def, most likely nitrogen or mag but id put my money on nitrogen. But now to the longer side of the story i noticed some purple on the stems you might be having a ph problem cuasing nute lock out. When growing in soil, PH can become the biggest headache ever. Take this advice and grab some dolomite lime it can be a plants life saver and make life alot less stress full for you.

I would say that this is a salt build up flush the plant through with water set a 5.0./5.5.Take of any full blown yellow leaves these have had it any how and use a pair of scissors to cut back to the healthy part of the leaves that are only harf effected.Get into a habbit of flushing the plants every so often even during veg about once evry 2/3 week.But once you have flushed the plants let them stand for about 3 hours the make up some fresh nutrients and feed them with the fresh nutes.I would also advice makeing nutrients up has you need them rather than haveing a big batch around.By doing this you always know that the ph is bang on the money and you aint gonna get nute lock out.And before anyone says it flushing and feeding with large quantitys of water will not hurt the plant has long has it is allowed to dry out then re feed.