Need some Help First time RDWC

Chrissa said:

Grew in soil for years now I only use organic soil outdoors, indoors for the past 5 years I've done coco DTW with alot of success.
But this year I wanted to get into RDWC. I notice leaves are getting some spotting, my guess would be PH but im not sure, PH sat at 5.9 for 2 days its now back to 5.5 and I have a controller/monitor now keeping it in the 5.5 to 6.2 range. More details below. Now I'm a complete noob when it comes to this and I know my values for somethings might be a little off. Really just asking for some help and guidance, maybe even some tricks of the trade u guys have to share. Thanks in advance,

Grow area size - 4x4x7 tent, main resivoir outside of tent

Lighting - LED 2X sp3000s

Exaust fan AC infinity T6 pulling air out the tent in this order Carbon filter/fan/ceiling tent exaust hole

Passive intake

Clip fan for air circulation inside tent

Water volume - 240L the net pots are even with the water level, no roots out of net pots yet

Oxygen - 2 X 4inch air stones in each tote, 18LPM pump

Waterfall style rdwc 3/4" waterfall lines and 3" pvc return 28LPM recirculating

3 buckets with 80L each 240L in total, 2 of them are for plants with 2 six-inch netpots in each

Nutrients - AN Connoisseur grow A&B and im running UC roots in the setup as well

Started 4 pure kush seeds in Rockwool only 3 germinated, these are the 3 in the system, once sprouted I put a layer of hydroton on bottom of netpots placed Rockwool ontop of this then filled in the rest with hydroton

Water change- done on Friday had very little ph down left so ph was at 5.7 then 5.9 for Saturday and Sunday, today Monday ph down came in and is back to 5.5

PH - Was 5.9 for 2 days but now is back down to 5.5

EC - has been .750 since water change on Friday

Water temperature - i know its high at 21.5° C
I don't have a chiller and haven't tried any other method of cooling

Room temperature - 24°C

Room humidity - 55%

Also on the white bucket lids, they were originally yellow, I sprayed them black and then white over top to reflect the light away

Now I know my water temp is high could this be the problem showing spotting. Or was it the fact that my ph sat at 5.9 for a couple days locking out certain nutrients
Pics attached
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hey can I ask what’s the total amount you spent on your set up for that 4x4?

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Chrissa said:

ec .750

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rkymtnman said:

check for signs of tip burn and add water to drop that down if needed.. that's kinda high EC for tiny plants.
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will do thank u ... seems my ec has dropped since then its sitting at .680 right now, going to check on them in a few and make an update

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