Help please- is this nutrient burn?

Everything I read says this is nutrient burn (see pics of leaves) . Please advise!

Here's the set up:
[FONT=&quot]Hi newbie here. FEEDBACK WANTED..comments, criticisms, complements, tweaks, 'look outs', etc welcomed! [/FONT][FONT=&quot]

Setup:
Closet with shelf for upper and lower growing
(01) 6lamp 54W High Output T5 Fluorescent Fixtures Chain hung to adjust close to plant tops
box fans on either side that constantly blow plants and push hot air to the ceiling
(01) 210 CFM exhaust fan mounted in closet ceiling with 8" ducting to external vent
soil consists of 1part perlite, 1part vermiculite, 1part worm castings, 1part sand, 1part peat moss to 4 parts miracle grow potting soil with a layer of those recycled rubber tree bark in the bottom of each pot for additional drainage

light schedule: 24hr
avg temps 70-80 degrees f.
soil ph right at 7

water schedule: (see meter in picture) I usually let it get to the dry portion before I water (never sure, I know this plant does not like 'wet' soil', but with the killer draining soil I wonder if I am not watering enough..why you ask? because the tops totally POP when I water, which on the large orange 5gal pots is about 1 quart a day on average...comments?)

Strains: all clones.
2 Large plants on the left are GODBUD,
the 2 Large plants to the right are LSD

Nutrients: I usually use just a half of teaspoon mircle grow for tomatos which is high in nitrogen maybe once a week.

What have I done lately?
Two nights ago I pushed a quarter each of 'grow tabs' by Nirvana.
Its yesterday and today that I have noticed the leaves spotting, curling and yellowing, especially the LSD on the far right.

[/FONT][FONT=&quot]So last night, I leached them alittle and the ones on the far right look much better, but I am afraid to 'overwater' if I leach them? (inexperience kills!)
[/FONT]
[FONT=&quot]
[/FONT]

Dude I have the same problem!!! Let me now how you fix this issue. I just flushed mines and letting the soil get bone dry then add 1/4 of fox farm grow big.

You're plants look fine to be honest. If it isn't happening all over the plant I wouldn't worry too much. Are they falling off a certain part of the plant? When my plants starting getting bigger, I noticed that some of the older leaves at the bottom started dying, and that's natural. Old leaves will die.

biffchicken said:

You're plants look fine to be honest. If it isn't happening all over the plant I wouldn't worry too much. Are they falling off a certain part of the plant? When my plants starting getting bigger, I noticed that some of the older leaves at the bottom started dying, and that's natural. Old leaves will die.

Click to expand...

mostly larger leaves on the bottom and undergrowth are turning. Not the whole plant, especially after I flushed. Its easy to get paranoid and I am glad it happened because it forced me into another level of 'learning' about ph levels and whatnot...your response is greatly appreciated!

you say soil is at 7 pH. what about the water and foods goin in. im assuming the run was 7...kinda high to be honest. they like it a bit lower. it is deff.
i see a few diff ones so i say pH is out.

Yeah, it'd be a good idea to lighten up on the feeding with MG. 1/2 tsp is full strength, and that's some potent stuff. I'd back down to 1/4 tsp, for now, and increase if your plants start showing deficiencies. With the smaller plants, I'm go weaker than that, 1/8 tsp, of at all. That soil sounds pretty rich, so they shouldn't have needed fert for at least another week, possibly longer.

Also, if you flush, there's no real risk of overwatering, as long as you let the soil dry out(within reason) afterwards. I'd flush, and give 'em a fresh start.

jawbrodt said:

Yeah, it'd be a good idea to lighten up on the feeding with MG. 1/2 tsp is full strength, and that's some potent stuff. I'd back down to 1/4 tsp, for now, and increase if your plants start showing deficiencies. With the smaller plants, I'm go weaker than that, 1/8 tsp, of at all. That soil sounds pretty rich, so they shouldn't have needed fert for at least another week, possibly longer.

Also, if you flush, there's no real risk of overwatering, as long as you let the soil dry out(within reason) afterwards. I'd flush, and give 'em a fresh start.

Click to expand...

thanks- great advise thus far...I did flush them all two days ago and it was hot (still is)...

they responded very well with new growth and less yellowing of leaves, then I really worked on treating the water and getting the ph levels down.
Run off water was approx 6.5-6.8. I flushed all the seedlings and the 2 new clones as well (grand daddy purple) which are doing killer!
Those two (GDP)I used the same soil breakdown using the 'solitabs' that Nirvana sells on their site. You plant your seedling/clone/seed right over this tab and its suppose to feed them the entire veg. life? It's working wonderfully so far.

I wish I could say the same with the seeds from Nirvana...so far only one of six seeds has germinated.

what is a good ph meter? any suggestions?

your feedback is greatly appreciated! thank god for this internet!

jawbrodt said:

Yeah, it'd be a good idea to lighten up on the feeding with MG. 1/2 tsp is full strength, and that's some potent stuff. I'd back down to 1/4 tsp, for now, and increase if your plants start showing deficiencies. With the smaller plants, I'm go weaker than that, 1/8 tsp, of at all. That soil sounds pretty rich, so they shouldn't have needed fert for at least another week, possibly longer.

Also, if you flush, there's no real risk of overwatering, as long as you let the soil dry out(within reason) afterwards. I'd flush, and give 'em a fresh start.

Click to expand...

What he said... Just make sure you let that soil try out after each flush! Its easy to overwater after flushing properly!

Void that sand, IMO...