What is this problem?

I think I have a def but not sure. This is starting from the bottom of a black water plant and a blue dream.
I am in pro mix hp. Ph to 5.9-6.1 last feeding was 4ml per gal in 1-1-1 ratio of GH m/g/b. I also added cal mag, protekt, this last feeding 2 days ago. Temps are 75-80 day and 65 night.

added a few new pictures. I am only watering like every 4th day or so. Media should dry out between watering a correct? Maybe I am not feeding/watering enough??
 

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I had same proplem but I was told its normal for bottom leaves to die the older the plant get but just me.. Ph is lil low I go with 6.0 and up
 
if the fingers are pointed down at the end is that related to nitrogen? causing nute lock and causing other deficincies the yellowing i used urea on an outdoor plant and this is what the leaf looked like im not experienced but through causing this problem with pure nitrogen and a bit of reading i would think thats what that problem is i flushed for a week and used nice light balanced nutes all rounder mg for tomatoes and vegs and there lushes now i waited for new growth before pulling leaves but all of my leaves were burnt please correct me if im wrong as i love learning
 
1st problem i see is , its off the plant. Leave them on and let the plant feed off them.

I have had N issues , that doesnt look like it to me.
 
1st problem i see is , its off the plant. Leave them on and let the plant feed off them.

I have had N issues , that doesnt look like it to me.

the leaves are a pretty deep green does changing lights to 12/12 create a higher need for potassium and phosphate and just changing to flower would still have build up of nitrogen from veg assuming in soil just a shot in the dark the tops of my plants[new shoots] also went a light green nearly looked like a crown starting a sick oneit might be another problem but probably caused from build of nitrogen from veg i can post pics of mine when this was happening from the urea problem and compare to yours when i get the chance as i said before just trying to learn so it dont happen again peace
 
I would not be overly concerned with this at this point. It is fairly normal to have low fan leaves start to deteriorate a little as flowering starts.
 
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