Newbie needs help

[Newgrow20]

Hi All,
This is my first time growing. I hope I can save this little gal. I have another one growing that seems to be doing well.
-Problem: This is my very first time growing anything. I am like a duck with no water, Lol. This Chelato is on week 4
-Medium/grow method: Mother Earth Coco/perlite but had to add about ¼ with Miracle grow for seedlings ran out of Mother Earth. In a 5 gal cloth pot
-Feed and supplements used: First 2 weeks only water then on week 2 calmag 2 ml/gal. week 3 first feeding with general hydroponics Micro, gro, bloom used half strength ½ tsp each/gal. Using 2 tsp CalMag every other watering. PH has been around 6.5-6.8. Initially I was using a watering can with fan top the covered large area but then read you should not do that.
-Water source: tap water
-Strain and age Chelato 4 weeks
-Climate: Indoor grow tent 65-75 F
- Light used: 1000W LED 20/4 cycle. 18 inches
-Additional info: I have another one that is doing well so far but this one I had to add the Miracle grow with some of the soil mixture. Very slow growth and leaves started getting brown spots then turned rusty and dry on old leaves. The spots started about a week ago mild dark turning into rust and the end of leaves drying up.

 

[automan2]

No idea about mother earth stuff but miracle grow is notorious for burning seedlings if overwatered because it releases more nutes...then adding nutes is kinda questionable . I grew in MG for years and it taught me a lot of lessons in watering.

 

[Newgrow20]

Thanks....I have heard bad things about Miracle grow after the fact. What would you recommend? Would it help if I tried adding more soil on top?

 

[Waira]

-- light is too close, seedling need less intense light... What brand light is using 1000w?? Actual watts, or "HPS equivalent?".... that said, it's only part of the problem,...
the MG seedling mix is light, low nutes so burn isn't the issue here. Mostly this is down to treating the coco like true soil; coco is soilless medium, and is run very differently from actual soil. Coco really is a hydro medium of sorts, and has a lot of do's and don't's to run properly... Look it up here in the Coco section, there are Sticky articles with info and links about it,...
Coco, like peat based Promix and Sunshine#4 are considered "soilless" because they are composed of very few components, unlike soil. They are largely devoid of nutes because of this, so feeding needs to start within a week,...
Your girl is starved and stunted, badly... it's up to you if you want to ride her out, but at this late stage she'll not offer up much, no way around it... Meantime, read up on coco, and see if you want to grind it out.. You will need a TDS/EC meter for sure, and a pH meter in good, calibrated working order... pH meters are delicate tools, easily knocked off calibration; need to be stored in the right solution, never let dry out, and calibrated often using a Standard soln. 7.0 at least, adding 4.0 helps dial it in even better...
Why? pH affects nute availability profoundly, and the pH scale is logarithmic in scale... Each jump of +/- 1.0 is in fact a 10x jump in [H+] concentration... IOW, decimals really matter!
My recommendation is to go with a quality soil and learn the ropes there, coco is bitchy and unforgiving if run wrong,... If you do, get a good soil pH probe like the Accurate 8 (CPW), not the cheapo skinny probes you see around, they suck... No Foxfarm soils either, a real gamble on quality... Roots Organic, Royal Gold King's Mix are good ones...