Clone problems

This problem is starting at the bottom and seems to be spreading up the rest of the plant. It's in DWC, ph is 5.9 it's a clone recently taken. Getting 20 hrs light a day. Using GH nutes, 2 part flora series adding calmag, humic acid. None of the other plants in the same reservoir are showing similar issues. Any advice would be greatly appreciated, thanks. Edit: other plants in rez are showing same symptoms.

Looks like calcium issues. Whats your water source? Are you using LED?

Also, can we see a pic of the roots?

Using tap water. Its 8.5 ph outta the faucet (ph down it to within 5.8-6.4) and 50ish ppm. Usually aerate for 24hrs. And yes under supposedly 300w shitty led and a low power CFL for now. Also the humic acid I'm using has fulvic acid and seaweed extract in it, just throwing that out there.
After some research I believe it is calcium issues as well. But using tap i shouldn't have an issue with that, right? Especially while also adding Calmag, which addmitedly I'm being pretty conservative with. 1/2 tsp. Per Gal.
I'm at work till late this evening, I will post pics of roots then. Thanks for your help!

Oddessc said:

Using tap water. Its 8.5 ph outta the faucet (ph down it to within 5.8-6.4) and 50ish ppm. Usually aerate for 24hrs. And yes under supposedly 300w shitty led and a low power CFL for now. Also the humic acid I'm using has fulvic acid and seaweed extract in it, just throwing that out there.
After some research I believe it is calcium issues as well. But using tap i shouldn't have an issue with that, right? Especially while also adding Calmag, which addmitedly I'm being pretty conservative with. 1/2 tsp. Per Gal.
I'm at work till late this evening, I will post pics of roots then. Thanks for your help!

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Yes need to see the roots assuming your doing the dwc right and have roots and the roots are hanging out of the net pot. Water temp 72 degrees ph to 5.8-6.0 checked daily and ppms are about 250 for that size plant you should see growth.
Yes it looks like a calcium deficiency, shitty mother shitty clones. 300 watts might be too much so either raise it up or just use the cfl maybe get a couple more cfl if ther are alot of plant or the area coverage is challenged till improvement occurs. cant see the whole grow so that is all up to your interpretation.

City tap water isn't the best water to use in a hydro set up imo. I think your ppms are too high by what i am reading.

Im fighting the same tthing,same rdwc.I tried upping ph 6.2 didnt help.I run 170 tap 150 calmag 700 ppm food.Other plants love it some just give you the finger.As renfro says could be a root problem,Ca is theere it just wont take it.

Oddessc said:

But using tap i shouldn't have an issue with that, right?

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Well you say the tap water is only 50 PPM after adding the pH down. So it's not bringing a lot to the party.

I asked about LED because your calcium to magnesium ratio needs to be more like 1:1 with LED lighting. With HID it's more like 2:1 to 3:1.

Too much potassium can lockout calcium.

Calcium issues can be tied to issues with transpiration as well. Make sure the humidity / airflow are proper.

1 mL per gallon of Calimagic will provide an elemental PPM of 13 calcium and 4 magnesium

I think your calcium levels total should be around 180 ish and the magnesium somewhere around 60 (elemental PPM).

Your adding 2.45 mL per gallon of calmag (not sure what brand) and with only 50 PPM of no telling what in the tap water I think you are low on calcium. With calimagic, assuming other bottles aren't bringing any calcium, and assuming that all 50 PPM of the tap water is calcium, 10 mL of calimagic would bring 130 PPM of calcium (180 with the 50 tap) and 40 PPM of magnesium.

You may wanna play with this calculator sometime

Sorry for taking a sec to respond. I appreciate all the insight and advice. I acted on the things that were glaringly wrong with my setup based on everyone's feedback. My ppms were way too high at nearly 600. I probably had too much phosphorus in the mix as well, as someone noted. Temperature in the res was also a bit high. I struggle with this, and will continue to until I can afford a chiller. It's stupid I realize this, and it is decently high on the list of priorities atm. Moving on...The led is about 30in above the plants in a tent with 79f 45rh, I am running a cool mist humidifier to help raise that a bit as well. Also the mother is an awesome specimen. These clones were initially super healthy in comparison to the numerous other clones I took from alternate strains at the same time.
I just changed out the res with fresh water and mixed a light solution of a two part and 2 tablespoons of calmag from GH. I also wanted to clarify that the ppm off the tap is 50 before I mix nutes or apply any ph down.
I dont have a RO water filter I suppose I'll look into one if they are affordable or a source if they aren't. I will have pics of roots shortly. Thanks again

Renfro thanks for the Nutrient Calc. That is really badass! It will take me a bit to figure it all out but it looks extremely helpful.