Advice needed! blue cheese / white rhino & ams

Hi, I'm stumped as to what's wrong with my ladie


Ill fill you in on the essentials:

50% RH & 74°F (doesn't vary much)

400w dual spec hps / T5 2X24w for clones
RVK100 extraction
Rhino Pro carbon filter
WBW sheeting & insulative foil

blue cheese / white rhino & ams
Mychorizzal fungi
Vermiculite
BioBizz all-mix soil ( extra perlite added )
biobizz A&B nutrition
Earth juice Grow & Bloom nutrition
Hygrozyme
strike
de-chlorinated water

The first pictures are of the blue cheese which has been experiencing these problems pretty continually, a lot of the tops are droopy and have serious interveinal chlorosis which seems to get progressively worst towards the uppermost nodes. At first i thought it was Mg def so i foilar fed and flushed with epsom salts but to no avail. I then started getting these rusty patches a few weeks later on the worst affected nodes. I then let the plants dry out more than usual between watering with half strength nutes to make sure it wasn't a simple case of over-watering or over-ferting but that made no difference.
The height of the light is fine, I have an air cooled 400w in close proximity (12 in' ) which i have now raised even further, but none of the other strains seem to be affected so that seems to rule out heat stress or light burn.
Also, did i mention that the new growth under the canopy is extremely healthy and showing none of these symptoms.










So yea, if anyone has any ideas then let me know.. i'm pulling me hair out here lol.

I am not an expert by any means but I would just water them with straight water for a week or two. Let it work its way out. How do you like the blue cheese? I am about to start a grow with it

mmm, i've already flushed with de-chlorinated water with hygrozyme for about a week or so and it made no difference..

and yea the blue cheese is lovely, a classic

It's from in to out. Maybe manganese def. pH?

PH is wavering around 6 / 6.5 depending on how well they are fed, which is less than ideal.
I guess that could actually be locking out mg, cal + zinc...?

so.. if i flush again and check the ph of the runoff - if it's still too low what would you recommend using to correct it? ( preferably organic )

Do you have dolomite in the soil?

not as far as I'm aware,

composition of bio-bizz all mix:
soil (20%), compost (35%), worm castings (10%) Perlite (30%) as well as a special 'pre-mix' (5%) of biologically active organic matter

It,s a pH buffer. Keeps it just below 7.

you're a diamond mate, +rep.

It looks like a trace element def like you said. Perhaps Ca.
When you add Mg are you adding Ca in equal parts? One cancels out the other, otherwise.
What is the EC of the water you use before you add nutes?

hey sublimed, I have heard that biobizz all mix doesn't really have 30% perlite like it states. Im going to get this soil. How much extra perlite do you add?