look at these leaves?

what do you think it could be? just on a few plants.

also seems to be on sides of plants where fan is blowing on them. recirculating fan. dwc set up. water at 123 gh solution at about 1500-1700ppm at 5.8-6.1 ph. 71-79 F and 55-65%rh

4th day of 2nd week in flowering.

i dont know if its actuallly hurtin the plants but thought it would be a good idea to know.

also i cut babies on the 6th of this month and two of them died. i have them in a constant bubble set up. i used the same neoprenes as i did last baby grow. which all died cuz i forgot to turn the air pump back on lol haha. anywho these ones are dead as you can see in the pics. i was looking today n saw that there was a some sort of wite mold or somehting at the base of both plants. right before you cant see into the neoprene.

whats this mold caused by and how could i have prevented it if i woulda caught it earlier?

thanks everyone.

the fist-like yellow leaves indicate a Phosphor deficiency to me.

Had a the same problem during my 1st grow. I little bit more PK 13/14 solved the problem. Just don't over do it.

So add a lil more phosphorus n lil extra potassium. Does the grow shops carry just those. Or what should I use. N what about the babies

Keep your ph at 5.8. Calcium and Phos lock out fairly low.

High humidity can cause mold.

You are running a high ppm, could that power be salt build up?

Best of luck.

I know Canna make a PK 13/14 solution.

i looked at them again today. dont really remind me of mold. but maybe ill try the pk sol. the rest of the plant and plants look great besides a few of these leafs.