Wk 8 grow in RDWC needs help!!

I’m at wk8 in my first RDWC grow, except the two plants in the back are in wk7. The strain is called Peanut Butter Breath, and it’s not considered a beginner strain. I think I have a major deficiency and need some help. I try to keep the ph at 5.8 and the water temp ranges from 67-71F. I use GH nutes, but not the h2o2, I use hydroguard instead. My total system contains approximately 15gallons of water (five 5gal buckets) and I use tap water starting out at an EC of 0.2 and after adding nutes (150ml) it only measures an EC of 0.297 or a ppm of (.297x500)=149. Since I’m in the bloom stage, my nutes consist of a 60/40% blend of VEG/BLOOM juice. I follow AC infinity’s LED light height above the canopy of 24” at 100% intensity.

Is the meter you are using accurate and calibrated? That EC in bloom seems real low. I would try be at least 1.2 in Bloom. I don't use your nute regimen so can't say to use bloom only or a mix between the two. Gut says more bloom nutes. Actual wattage from wall is the light? Humidity and ambient Temps? Don't panic, lots of help on this forum.

Screw any light companies recommendation. Always go off the plants behavior. They look underfed. All around missing out. I would check that meter you’re using.. possibly borrow one from a friend to compare.
How much of the GH nutes are you using (in measurement by what you use to measure) per gallon, to the 15 gallons of water?

When I feed, I’m adding 150ml of nutes to the 15 gal system. I keep humidity @51% and temp @75f. Problem seems to be getting worse. My plants are dying

What EC meter do you all recommend?

Lots of membera here use blulab meters. I have one I bought off Amazon for like $60, dont recall brand. Also with a LED i would get your temps up into the low 80's when the light is on. Well water can also be hit or miss, i had well and eventually got a ro water filter for my system. I am confused when you mention "when I feed I add". In my RDWC i keep the feed solution constant so they are always feeding.

Just looked, my ppm and ec meter is a cheap home forest, but my ph meter is Apera.

Mr. Mohaskey said:

Lots of membera here use blulab meters. I have one I bought off Amazon for like $60, dont recall brand. Also with a LED i would get your temps up into the low 80's when the light is on. Well water can also be hit or miss, i had well and eventually got a ro water filter for my system. I am confused when you mention "when I feed I add". In my RDWC i keep the feed solution constant so they are always feeding.

Click to expand...

Mr. Mohaskey said:

Just looked, my ppm and ec meter is a cheap home forest, but my ph meter is Apera.

Click to expand...

When you give them food you get some ppm how is the ppm next day less or more?

Looks like you are really underfeeding but the ppm will tell you all.

As for the meter i have been using aliexpress 3$ meters fhey work great for 1 year