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Nutes act as a pH down. That might help explain a bit of what's going on there too.
Feed just as much as they need to stay medium green... not dark and not super light. This will change for each plant and it will change with how much light each plant is getting. Humidity and temp also affect but to a lesser degree... until they're way out of whack. lol
TDS should slowly drop (pH will rise) as the days go by.... when pH is at 6.1 or so, raise the TDS with nutes and the pH should drop back down. A well setup and run system will require very few pH up/down changes and most maintenance will be done with nutes only.
Fun!
Keep it Clean!
I'm in the process of writing a tutorial that covers all this... Hopefully I get it finished and posted sooner than later.. eh?
It's really quite simple once you can wrap your head around the basic concepts... the problem is the HUGE wave of crap information on the net right now, combined with the HUGE wave of new growers that learned from this crap information. *facepalm*
They're just trying to help, I know, but bad information spreads soooo quickly. LOL
Keep it Clean!
Yes, you're on the right track...
I'd suggest switching to the simple res management method for the lucas formula for now. Mix your res at a nutrient strength that has them dropping the ppm and raising the pH on a steady basis. Should take about 5-7 days for it to go from 5.2-6.1
The res size needs to be appropriate for the plants and lights being used... 1000w HPS with 6 plants will need about 40 gallons of water for a proper swing period.
400w HPS is about a 12-15 Gallon reservoir.
150w HPS was about 5-8 gallons? I forget as it was over 10 years ago now. lol
The larger the reservoir... the slower the pH swing is going to be. Too large of a reservoir and the pH swing isn't fast enough and the plant will show deficiencies... too small of a reservoir and the pH swings will be too fast and cause the same thing.
When all your DWC variables are set up properly... pH takes care of itself.
The simple reservoir management method is to mix your res and pH it to 5.2.
Add plain R/O water to the reservoir every day so it is "Topped Off" to the same level every day.
Check the pH every day after topping off and record it so you can catch any issues quickly if they show up.
When you've added the same number of gallons of plain water that your res holds... dump it and re-fill.
That's it.
With different nutrient profiles you're going to have different top and bottom pH ranges. Some nutrients are so wrong for cannabis you actually HAVE to hold a steady pH at the range that releases nutes the way cannabis needs them. Ouch.
Hope that helps...
Keep it Clean!
sounds gross in the bucket.
I'd pull the plant from the bucket (leave it in the rocks) and rinse the underside and the bucket. It really depends what the slime is as to what treatment you should use.
I'd start with just lots of bleach once the bucket is rinsed out and spray the visible roots with a weak peroxide solution... rinse a weak peroxide through the pebbles as well for the rest of the roots.
Re-mix and set her back in. See what happens in a few days to a week. You'll either get snotted out again and have to look deeper or you'll be peachy keen.
Keep it Clean!