Potassium Deficiency and Some Other Concerns

Pictures 1-3 are plant 1, i believe this is just a potassium deficiency, im cleaning out the room today and im going to up the nutrients to vegetative so that should fix it.

Picture 4 is plant 2, the rest of the plant looks fine but that split and slight yellowing showed up a week ago or so and it seemed kind of odd.

Picture 5-8 is plant 3, it was doing really good up until last week when the top of the leaves started looking drained, to the touch the leaves feel kind of rough, moist but not as moist as the other 2, theres no visible bugs on the plant, the only thing i could thing of is maybe a calcium or salt build up.

The last 2 pictures are plant 1 and 3, i remember in "i grow chronic" there was some green "stuff" on top of the cubes he was using (about 2 weeks), im just curious if this is the same or if i should be worried about it?



The seeds where from multiple bags, just seeds ive collected, im pretty sure plant 1 and 2 is some type of afghanica and 3 is a indica sativa cross.

My garden is 24hr, watering 3x a day, the plants are 1 month old under 2 x 25watt led light boards (i assume this is why they arent that tall).

I truly know nothing about LED growing but those plants don't look that bad at all. They seem like they are still adjusting to your schedule. Keep it consistent. Small pieces of plastic, Like the kind that came wrapped around the rock-wool prevents light from aiding in algae growth. It is really easy to over diagnose and try to correct an issue and end up doing more harm. I've noticed when I'm not satisfied with my results I back away and stay consistent, They have always pulled through. Your Op looks like a great start to me. Keep us updated!

i pulled the plants out to clean the room today and found a weird looking spider on the rock wool, i whet ahead and killed it but im wondering if it has to do with the discoloration of the leaves.

i couldent find any other bugs on the plant.

also im noticing more and more fungus on the rockwool, what is a good fungicide?

Well it dose not look like a spider mite so I wouldn't worry about it..most spiders around ur plant is a good thing.. they keep most pest away

so iron then?, the other 2 plants (fed by the same nutes) look good so is there something i could add to the rock wool or possibly adjust the ph to induce a higher iron intake? (i keep it 6-6.5)

so ez thats PH all the way