First indoor grow: Need some help

[IriahGrower91]

Hey guys. I’ve been silently creeping the forums here on 420magazine for some time. Finally decided to sign up. I’m currently 8 weeks (from germination) into my first grow. I’m looking for some help with yellowing I’m seeing on new growth. I suspect it’s because I’m using RODI water (marine tank owner so have unlimited RODI water at my disposal). Currently growing in Palgron all mix soil and dosing @ about 70% strength REMO nutrients as per the online calculator. I’ve gradually increased the strength of my feed to 70% based on the response of the plants. Judging by the yellowing of new growth im suspecting CAL/Mag and or a possibly zinc deficiency. Any tips or pointers greatly appreciated. I’m cautious to increase my feed strength as they are only guides can can tent to be a little hot for most.

2 x GreenHouse Seeds: Jack Herer photoperiods.
Light: 400w MH. 18/6 (currently @ week 5 of veg)
30l fabric pot. Repotted last week from 8ltr fabric pot. Soil Blend of: Palgron All mix & Bio Bizz light mix used for repot up to 30l.
Feed every 3-4 days depending on soil moisture. I last feed 8ltrs (1ltr run off) @70%. with a PH of 6.5 using PH up (5.6 before I added PH up (no PH buffer). The run off PH is coming in between 6.2 - 6.4.
Temps 27c day. 22c night.
Rh 45-65%.

 

[Bush Doctor 77]

Welcome. If you are using just DI, need to add Ca/Mg for sure.

 

[IriahGrower91]

Welcome. If you are using just DI, need to add Ca/Mg for sure.

Cheers for the heads up. I’m using the full Remo line up that includes a CalMag supplement. I noticed the Remo nutrients ‘MagiCal’ has an Iron content of 1% so I’m a little hesitant to use too much. Should I pick up some straight CalMag or is Epsom salts an option also?

 

[013]

Welcome to 420... Epson does the magnesium but you would still be lacking the calcium.... however I’m a soil grower and hydro is whole ‘nother can of worms. I’d go with straight cal-mag, not sure about the iron content for hydro... it would be fine in soil but water changes a lot of stuff!

 

[Islandgrow]

Your plants look fine in the pics . And having the grow tips a little lighter after lights on is normal they will green up . Just keep an eye on them.

 

[HashFart]

They look good brother ,don't over feed them

 

[IriahGrower91]

They look good brother ,don't over feed them

I think they needed to be flushed. Potentially nutrient toxicity. After speaking with Joel from REMO it looks like the DI water with fertilised soil doesn’t need any of the base nutrients. I’ve decided to flush today. Here’s how they look pre flush. I will post another update in 3 days

 

[HashFart]

I think they needed to be flushed. Potentially nutrient toxicity. After speaking with Joel from REMO it looks like the DI water with fertilised soil doesn’t need any of the base nutrients. I’ve decided to flush today. Here’s how they look pre flush. I will post another update in 3 days

Well you caught it in time if that's the problem , ,,,, I personally under feed slightly and whatever the plant needs i give it , if it needs anything ......... I would rather have a deficiency then note burn or a toxicity but that's just my personal opion , your plants look good brother keep up the good grow

 

[HashFart]

I also think its normal for new growth to be a lighter color ,,,,,, I watch for waxy looking fan leafs thats how I know nute burn is about to occur in my experience , first you will see waxy dark leaves second the leaf tips will be burnt and I've never made it to third , I try to stop feed before the tips burn and thats how I know they are taking in as much as they can ,, but I'm also new to growing myself only a couple years experience