2 weeks old: too hot? over watering? defeciency/nute burn?

These lemon skunk seedlings are 2 weeks old and just started showing problems in the last 48 hours.

Moved these 3 from the T5 room to the 1000w (dimmable) metal halide room yesterday which is a good 3 feet above the buckets. This room has better climate control with an air conditioner in the room.

They showed these symptoms before changing the nutrients and moving to the adjoining room yesterday, but have gotten a little worse in the last 24 hours.

The room temperature was fluctuating some when they were under the T5. Showed a max temp of upper 80's and rH stays around 15-25%. They have been at a consistent ~75 degree room temperature for the last 24 hours since moving to 1000W MH room.

Nutrients:
Feeding botanicare line at very weak 25% of what is recommended for week 1 veg. I just increased the dosage to about 50% of recommended for week 1 veg. Full strength CalMag. Full strength roots excelerator. Using bottled water. pH at 5.8, but it seems to be climbing to 6.1 at max after a few hours, but I adjust it back to 5.8-5.9 several times a day. PPM is 400 still 24 hours after changing out the reservoirs.

All 3 of these lemon skunk are fed the same since they are all attached to a 3 bucket RDWC. 1 looks like it's doing OK, the other 2 look like they are suffering some.

Watering:
I just put in a cycle timer to do the top feed and am unsure if 5 minutes on 5 minutes off is too much. This curling of the leafs downward - is it over watering? Roots look good and are floating in the buckets with airstones bubbling the water well. Water temp is 70 degrees.

Any ideas? Full details of this newbie grow can be found in my journal posted here: https://www.rollitup.org/grow-journals/617223-1st-time-journal-6-plants.html but I will be happy to give more info here for anyone that doesn't want to read through all my ramblings in the journal.

Any help is much appreciated.

Apologies for cluttering the forum with this post, I probably should have asked here as a last resort and searched a little harder before posting.

I think I might have found the problem, not enough oxygen seems likely. I dropped the water level so there is at least 3" between bottom of net pots and the top of the bucket's water level.

How could you over water when your medium is water?

I am a noob, but I thought there was some benefit to the roots "seeking for water", helps them get more established. I understand your point though. If I could just run the top feed 24 hours a day and have the same result as using a cycle timer that top feeds in intervals then did I just waste $60 on it?

I run a bubbleponics system and have a continuous feeding tube to the roots, they have reached the medium, once you see about 10+ roots hit your medium you can cut out your pump to a non continuous feed and have it on a timer. This is because the roots will grow into the tubing. You cannot over water with a pump believe me my plant roots have NO issues and this is my first grow. Now to answer the looking for water situation, they'll find their way don't stress your babies out man, the feeding hose will not supply them with what they need and they will go looking for more. If you don't have any airstones in your DWC get some! I got 2 in my 6 gal tank though I have plants sharing it, they love and I mean LOVE airstones the root clusters sit right above the stones sucking up everything they can. Wish you the best.

LogicTime said:

I run a bubbleponics system and have a continuous feeding tube to the roots, they have reached the medium, once you see about 10+ roots hit your medium you can cut out your pump to a non continuous feed and have it on a timer. This is because the roots will grow into the tubing. You cannot over water with a pump believe me my plant roots have NO issues and this is my first grow. Now to answer the looking for water situation, they'll find their way don't stress your babies out man, the feeding hose will not supply them with what they need and they will go looking for more. If you don't have any airstones in your DWC get some! I got 2 in my 6 gal tank though I have plants sharing it, they love and I mean LOVE airstones the root clusters sit right above the stones sucking up everything they can. Wish you the best.

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Thanks for the explanation, very helpful.

Each bucket has either an air stone (round ones from hydro shop for 8 bucks) or a diffuser ($20 from hydro shop) connected to a commercial air pump/8 port manifold that is ridiculously loud.

Was the cycle timer completely unnecessary?