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You should be filling to a decent height otherwise you're limiting the amount of roots you can actually have. You want to be filling 2/3 of the depth of the table, and yes, using the overflow to regulate, that's what it's there for. No, 4 hours wont drown them.

What are you feeding them? You definitely need to do some thinning of that canopy, I can barely tell what I'm looking at there.

Looks fine. Chill.

Tap water. 6.0 Formulex at 1/2 strength. Foliar feed with formulex at 1/4 strength. Clonex. Diagonal cut, scrape 1 inch of the dermal tissue lightly with a scalpel. Dome on for 10 days. Half open 2 days. Open 2 days. Pot on. 2 week fully rooted clones with about 6 inches of root mass. 100%...

Absolutely 100% you should water according to height. The idea with flood and drain is to do it fast, so that you can get full height on your pots without having them in the water for too long. 6-15 minutes.. it's all personal preference. I feed for 10 minutes but my fill time is rapid. 15 mins...

One lot of water for the flush will be fine. Note what happens to the pH and PPM. It's just watering as normal, for a few times, using only pH'd RO water.

No not top water. You need to let them sit in it so they have time to process out the crap. It's not just the rockwool, it's the actual plant tissues which are clogged, imho. Ditch your res entirely. fill it with RO water, pH it to 6. Feed them for 15 mins, every 2 hours, say.. 4-5 times.. then...

Better still, root in aero and straight to clay pebbles. Reusable, inert, tons of area for your bennies.. and most importantly for you.. easy to flush!

Yep. clear as rain now. Drop the cal-mag. flush them through with pH 6.0 water a few times, don't just top feed them, although you can to get an idea of whats in the root zone, but give them some time to process out the excess, then feed without adding cal-mag. Keep that shit on standby for if...

Worth adding, if you are getting confused.. you have Calcium and Magnesium deficiency.. (in that last grow, looks like just Magnesium so far in this one) however, it may be the fact that you are using too much Calcium and Magnesium, that is giving you the deficiencies as you are actually locking...

This is what I would do. Flush them for a couple of feeds with RO water at 6.0. Note what happens to the res after the feed.. does the pH and ppm move a large amount.. then, start feeding them a simple Lucas formula without calmag. Ha. I just saw rkymtnman has beaten me to it.

From those pics of your last one It's 100% calcium AND magnesium deficiency.. and if you are using RO and your pH is right, I literally have no clue as to why.. get a second pH meter.. Something is off, somewhere.

Yeah, those are not healthy looking plants...

Then I am stumped, honestly. Which exact cal-mag are you using and are you adding it first? if you add it first, what does the PPM come in at before you add nutes?

OK, so.. that changes things. What is your tap water PPM?

GH is the nutes you have. General Hydroponics. Lucas formula uses only 2 parts of the 3 parts, there being enough of everything if you use a 2:1 bloom:micro all the way through, from seed to flower. It just makes everything really, really easy. It isn't perfect for every strain, and you may need...

What the hell is that thing? It's cotlydons are still on and it's flowered... 2 months old? A plant should be bigger than that after 2 weeks..

Just looking at the placement between the plants and their structure, I would flip yesterday.

I don't know much about rDWC but one look at the setup I'd bet my house that you have an airlock.

Honestly that looks like mag def all over now. If they've been hardened off, your meters are good and , I'd say your problem there is mag def. Now I can't tell you to drop your feeding schedule that someone has lovingly prepared for you, but I am a huge advocate of Lucas' formula. Whenever I...