HYDRO Leaf diagnosis

[goodgrowbuds]

Hi, I hope one of you good people can help. I am new to this forum and this is my first grow (apart from when I was a kid 25 years ago when I grew a shitty male plant from some dirt weed I'd bought)!
I have a small 60 x 60 tent with LED lights. In it, I have 3 plants, 1 x Purple Bud Auto and 2 x Afghan Pearl Auto from Sensi Seeds). All are about 7 weeks into flowering, so getting very close to the chop, the purple bud being maybe a week ahead of the others.
About a week ago I noticed a couple of leaves of the Purple bud starting to show small brown spots, since then it seems to have spread. Up until this point everting has gone well and it is the first problem I have observed. The leaves of the Afghan Pearl all look healthy as do all the buds.. They are all fed and watered from the same hydro tank, with the same nutrients and same PH Level (between 5.9 and 6.1 consistently). The lights are about 14" from the canopy which is all pretty level. I've been super pleased with my first effort but this is worrying me a little so I thought I'd ask for some help from more experienced growers.

Attached pictures below of one of the purple bud leaves and one of the afghan pearl leaves. Also pic of the Purple trichomes- I think it is close to the chop?

Thanks for any advice you can offer

 

[Gingerbeard]

Hey goodgrowbuds . Give us a shot of your entire plant in natural light. This late into flowering, it might be normal.

What are the nutes you're using?

 

[alltatup]

What's your pH in and out if you're growing in soil?

 

[goodgrowbuds]

Hi Gingerbeard and alltatup, Thank you for taking the time to reply, I really appreciate it. The grow is Hydroponic and the PH is pretty consistent 5.9-6.1 since the start. I am just going into the 8th week of flowering so maybe the Purple is nearly ready. I have attached some more photos in a more natural light but I am no great photographer- hopefully they are good enough for your thoughts on the brown colouring on the leaves. Another point I should mention is the nighttime temp is down to about 10 degrees C (50 degree F), this has only been fore the last few nights, daytime is about 22 C (72 F).
In regards to the nutrients I am using a brand called Plant Magic +- photo attached also.
I wonder if it is just time to start flushing? If so, how long do you recommend flushing for in Hydro, I have read many different suggestions ranging from a few days to two full weeks.

Thanks again!

 

[alltatup]

goodgrowbuds Can you please show some pics of the roots?

 

[Gingerbeard]

I'm pretty sure you're fine. 8 weeks of flowering means you're in autumn. Some plants turn their fan leaves purple at the end of flowering. The plant is putting all it's energy into making buds. Your fans might die and fall off.

They're great looking plants.

 

[goodgrowbuds]

Thank you both for your responses. I am not sure how I will take a picture of the roots as they are in the clay pebble medium and a few are running through into the tank below- I'm would be worried about moving the pots incase I break any of the roots leading into the tank.

Do you think now is the time to start flushing with pure water for 10 days or so?

Thanks again.

 

[alltatup]

I flush for less than a week, depending on how the trichomes look.

 

[goodgrowbuds]

Thanks- I will likely give it another week before flushing. I think the purple will have to go a little long and the other strain that is a bit behind may haver to be a little early because I need to chop them down at the same time and use the tent to dry!
I guess these are the rookie mistakes I need to learn, making sure if I grow more than one strain in the same tank/tent that they finish at the same time!

Thank you again for your views ✌️