My first coco grow, thoughts?

[ChemPro]

Today is the start of week 8 of flower. I attached some pictures. I am not sure if I have a problem or not. Some yellowing of leaves, brown spots on certain areas. The yellowing seems to be dominant in the center.

Thoughts?

Info

• 20 plants, clones from Original white widow from Paradise seeds
• 1000W HPS
• 590 cfm exhaust fan
• all plants are grown in 2 gallon smart pots
• Using cocotek nutrients A+B
• Used tap water originally, adjusted it to 5.8, past week i've been using RO water
• watered once a day by hand
• my coco is calcium enriched and did not require hydrating

 

[Septumm]

To me it looks like a calmag deficiency. I think at this late in flowering it is nothing to worry about and I also believe a lot of people stop adding extra calmag when they start flowering. Had this happen on my last (first) grow.

Also what size tent, and is it a pain to manage 20 plants? How do you go about watering that many (especially ones in the back)

 

[ChemPro]

Its a 5x5 tent. It opens on the left, the right, and in the front. I have to water from all openings. I water 6 from the left opening, 4 from the right opening and 10 from the front opening. It takes about 5 minutes to water the whole tent. Its not too bad. I also have a long stemmed funnel that helps but isn't necessary.

 

[FullyRootedFarms]

Pretty sure that is a cal mag deficiency.... I use calmag until week three but honestly each strain is unique in the amount of calmag they need. For example, OG is a heavy feeder when it comes to calmag. Since you are close to harvest, I wouldn't add any calmag just keep it in mind for your next grow

 

[FullyRootedFarms]

Just saw that you are using Reverse Osmosis water which tends to strip the majority of calcium out of the water. More evidence of calmag def

 

[ChemPro]

Just saw that you are using Reverse Osmosis water which tends to strip the majority of calcium out of the water. More evidence of calmag def

I had to go to RO water. I was at 400ppm out of the faucet. I love how stable my pH is now though.

 

[Septumm]

Nice! How long do you let them veg for/how tall do you let them get before switching to flower? Do you start from seed or clones? Seems like an awesome way to fill a tent quickly

 

[ChemPro]

Nice! How long do you let them veg for/how tall do you let them get before switching to flower? Do you start from seed or clones? Seems like an awesome way to fill a tent quickly

I started from clones. I vegged for almost 2 weeks then flipped. Just transfered 49 to a 3x3 flood table and flipped as soon as they rooted.

 

[Septumm]

I started from clones. I vegged for almost 2 weeks then flipped. Just transfered 49 to a 3x3 flood table and flipped as soon as they rooted.

Wow that's quick! Keep up the great work thanks for answering my questions