All My Tops Turning Yellow?!

[Thejoseph]

So I'm currently on day 3 of 12/12 flowering and today I noticed all my tops are yellowing ... this has never happened to me before with my previous outdoor grow and this is my first ever indoor grow.

Specs:
•600wattHPS cooled by powerful fan
•General hydroponics advanced nutrients flora trio + cal mag
•Black magic Coco coir mix
•general hydroponics ph test kit
- humidity stays around 40-50% and temp stays in the 70's

I've been watering them ONLY with REverse osmosis water since seed...however yesterday I didn't have any on hand and the ladies needed water badly so I used tap water but without cal mag. I'm thinking maybe they didn't like the sudden use of tap water and that's what's happening but idk and I'm worried. Any help appreciated!!

Strains: 3 LA ultras, 1 white widow, 1 green crack and a bubblicious.

 

[MidwestToker]

If you're in coir just give them a fresh feed with nutrients to runoff and you'll be fine. But I don't really see a problem in that pic. All new growth comes out a lighter green at first. From your pic it looks like you're nutrient formula is a little high, Or their under insufficient lighting. What are you running for lights, nutrient strength ?

 

[MidwestToker]

Sorry , just smoked a bowl. 600 watt air cooled with glass ? If so move the light closer.

 

[Lbgrower]

Sorry , just smoked a bowl. 600 watt air cooled with glass ? If so move the light closer.

*18-24 inches for 600 watt...
may want to step that light up to a 1000w to cover that area :)

Oh yea plants look good coco does that early in flowering like @MidwestToker said feed to run off you will be great.

 

[MidwestToker]

Personally, I never liked running air cooled hoods. I really don't know of any Hid lighting manufactures that spec there bulbs for air cooled applications. Expect a 3-5% loss in intensity with glass installed. That's My biggest expense in my garden is my lighting.

 

[Lbgrower]

Personally, I never liked running air cooled hoods. I really don't know of any Hid lighting manufactures that spec there bulbs for air cooled applications. Expect a 3-5% loss in intensity with glass installed. That's My biggest expense in my garden is my lighting.

How much does a reflector diminish light intensity? I've heard the half of the bulbs light that's reflected is greatly reduced.

 

[hiboy]

I heard the glass takes away at least 10% of the lumens
Hb

 

[hiboy]

I would lower the light and not get 1000 watters you'll probably have heat issues
Hb

 

[Dan789]

Personally, I never liked running air cooled hoods. I really don't know of any Hid lighting manufactures that spec there bulbs for air cooled applications. Expect a 3-5% loss in intensity with glass installed. That's My biggest expense in my garden is my lighting.

No shit, mine too. But you do have options. (My evil twin couldn't help himself from throwing that out). The equation works out to the cost of ownership, basically either a nominal cost for a light and then high utility costs or a big assed cost upfront for a fluence or equivalent light then moderate utility costs. Pick one.

 

[G gnome]

All that is is new growth is lighter in color. Ur all good man dont sweat the petty shit pet the sweaty shit haha

 

[MidwestToker]

No shit, mine too. But you do have options. (My evil twin couldn't help himself from throwing that out). The equation works out to the cost of ownership, basically either a nominal cost for a light and then high utility costs or a big assed cost upfront for a fluence or equivalent light then moderate utility costs. Pick one.

Ventilation and a good ambient air temp. Here's a 4x4x7 grow box with a open reflector 600 Intake air at 67* , 4" 170 cfm fan and filter combo. Do these look like they

have a temp problem. So size your ventilation for 1 min air exchanges and you won't have any problems

 

[G gnome]

Ventilation and a good ambient air temp. Here's a 4x4x7 grow box with a open reflector 600 Intake air at 67* , 4" 170 cfm fan and filter combo. Do these look like theyView attachment 697835 View attachment 697836 have a temp problem. So size your ventilation for 1 min air exchanges and you won't have any problems

Sexy!

 

[Dan789]

Very frosty, nice job, looks like three foot + colas.

 

[MidwestToker]

Just saying air exchange is a good thing. Here's

a pic of how close you can get a 400 open reflector to your canopy.