Click to view attachmentClick to view attachmenti have been growing a while just started using biobizz grow/bloom/max, growing in soil ph 6.8 humidity about 60 drops to about 40 when ready for water, i started 12/12 6th april mixed products as sugested and all was going good till i noticed two of my plants did not look to good, the leafs had light green patches to start with so i flushed not fed since but seems to be getting worse now as leafs are turning yellow and mottled green, any help please as i have not had this happen before and dont know what to do

check underside of leaf for mites

they are mite free looks like mite damage on pic but its not, another pic think this ones betterClick to view attachment

pic of her next to a healthy one Click to view attachment

perhaps she now needs a good feed? i was watching a grow dvd yest and apparently in soil if ph is to low it blocks out nitrogen uptake which u may have although im not to good on diagnosing stuff, optimol ph for soil is 7 i belive?

Need more info mate min/max temps, air exchange, compost, how much u feeding them, how long have u been feeding them could be alot of things.

E2a:- what light and how far from canopy and size of area

soil murphy multi, temps between 19&26, 2x600w hps grolux(not to close) ph is under 7, tap water is always 7 and left at least 24hrs, only had a cpl feeds biobiz grow/bloom/max i have not used before went a bit to steady i think as their mixing guide seems alot ,ventiation xpel air 2x 1 for intake 1 for out runs 24/7, 2x desk fan one just under hight of lights on timer,other on plants 24/7, they have been in flower since 6th april, i think its under ferted but i thought i had over done it and flushed her with pure water, only gave her water since and was getting worse by day, i think i have caused more problems by flushing her with just water, last night i flushed her with bat guano tea hope this will pick her up, the other plant not as bad i have not flushed her yet with the guano tea want to see if the bad one picks up first.

it could be magnesium def.

yea i am thinking that or zinc, used bat guano it says on lable 4% magnesium hope she starts to pick up lights come on in 20 mins so can see if any slight change in condition but will probly be tomorro before see reaction.

Are these two plants close to your intake fan and is that air cold? Do you water before lights off with your intake fan blowing hard on them?A sharp drop in temps will lock out the nutes and water will sit in the soil so it might be better to repot into something slightly bigger pot wise with fresh soil as well.

move em round all time , but their was a cold spell 2 weeks ago for a few nights(my backdoor panel had been kicked in) problems started after that

its all been down to a faulty ph meter my soil ph is 8.5 which is way to high, was reading 7 on meter

Maybe it's that you've been messing around with the pH in the first place that's led to your troubles - pre-mixed composts are inherently self-buffering, and you shouldn't really need to mess around with the pH at all.

i have never messed with ph up to now i have not had too, if my soil meter had been working i would have noticed the sudden rise in ph, i also have regens on their 3rd veg and they are showing they are not happy so i am putting the biobizz back in the cupboard out with the canna and phostrogen have used that and had very good results, think i should read up on organics bit more and try with a few of my plants on next grow(already started).