Hi guys, I am absolutely new to this forum so I apologize already for any mistakes that I make posting in this forum. I am having a very frustrating issue with my plants and coco coir. I planted one G13 Haze and one Hash Bomb in a coco coir substrate purchased locally. I am in Chile, South America. The substrate is 40% coco, 40% perlite, and 20% of what they call "light" worm castings. I germinate plants in jiffy pellets and then they are planted directly in 6 liter pots. I have an indoor setup, a 75 cm tall x 60 cm 70 cm wide by 50 cm deep box, and use CFLs, which have worked perfect for my setup. The plants looked very healthy while in jiffy pellet but once transplanted into coco coir substrate, they almost immediately started struggling. I originally started them in a watering schedule every 9 days. However, when plants started struggling I called supplier of substrate and they recommended a watering schedule of 2-3 days, depending if top 2-3 cm where dry. They also recommended a pH of 6.5 - 7.0! Everything that I have read tells me between 5.7 - 6.2 (as absolute max). Additionally, they also recommended the use of nutrients from day one (I though cotyledons took care of that for the firs two weeks). Of course they sell Biobizz nutrients and that sounded more like a sales pitch than actual help. They also claimed to not know Advanced Nutrients. I mean, regardless of your opinion about the brand, who in the Cannabis community does not know AN? That made me take their advice even more with a grain of salt . I initially started the plants on a 24/0 light schedule, but then reduced to 20/4, and now 18/6 thinking that the plants were suffering heat stress. However, after the switch, the hash bomb still is showing sings of struggling (actually dying). Average box temperature: 28-29° Celcius. Average box humidity: 55-60% (we are in South America and I live right next to the Pacific Ocean ). Right now I am watering the plants every 3 days, 6.5 pH (average), 1 liter RO water, 1 tea spoon Epsom salts, 3/10 ml Sensi Grow A+B (Advanced Nutrients). Very little runoff comes out. I am posting a picture. I thank you for any advise that you can provide. I truly hope that I can save the plants. If you require further information I will be happy to supply it. I thank you in advance for your help.