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@Dr. Green alright, thanks. I'll do that. Hopefully they will recover alright. I'll post an update later on hopefully with better looking plants lol. I've got space in my room so I'll start a few more seeds heeding the advice everyone has given. With better luck, I'm sure it will go well.

In my previous grows (years ago), I used to just use an organic premix and mix perlite as the medium and then use talborne organic veg and bloom nutrients, but only once for the vegging and once for bloom. I think they're slow release, if I'm remembering correctly. And then substitute with seagrow every couple weeks. Seagrow tends to be weaker than BioBizz I think which is why I never had issues. Now that things are 'easier' and better to grow here, I'm finding it quite difficult to grow indoor and with cannabis intended equipment/nutrients. It's pretty demoralising.

So I would think the solution to try save them would be to just flush them and water them without nutrients till they start recovering and then going to a less than normal dosage of nutrient feeding till they're healthy? Or what would be a better suggestion? Btw, thanks for the replies! Great community.

Once a week, half a tablespoon per 5 litre bucket. Works out to about +-8ml per 5 litres which makes sense that it would be a bit too much. The actual biobizz bloom and grow bottles state 2 - 5ml per litre... That's a bit worrying. @Totemic my medium takes about a week before it starts getting dry to the point that it needs watering. I'm using 20l bags to grow in. I end up using +- 2.5 litres per plant for watering.

Hello @ORGANinc. and @Jimmy-z Thanks for the replies. I used Freedom Farms organic medium and BioBizz grow once a week following the feeding guidelines. I've got two clones growing outdoors using similar medium and nutrient feeding and they're healthy so that's why I've been so confused. What would you recommend the best way to save my plants would be? I was going to flush them with clean water a couple times today...

Hello everyone I made a post about my lighting and temp control of my grow space a little while ago but since we going through a little bit of a heatwave, I'm struggling to keep my temps under control. I just wanted to know if the placement of my exhaust fan is fine as well as any tips to get the temperatures under control. I have two fans in the space, one oscillating and one fixed in opposite ends of the space but I'm still getting hot temps. The roof of the grow space isn't insulated and I think that's a major problem. So next week I'm going to get 140mm insulation to put in the ceiling to hopefully disregard it as a factor. My plants seemed to be getting better with the addition of an extra fan + plus increasing the exhaust power but now, it's an issue again. The lights are also getting hot, which is bad for efficiency, pointed out by a few members on the forum. Here's the exhaust placememy: and here's how the plants are looking Please refer to this post for lighting and other grow factors. Thanks for assistance. It is much appreciated.

@CreX I was initially looking at umol and wattage but obviously wanted decent quality diodes thus chose Samsung's offering. I've seen good things about them. I'm only growing around 6 plants for now in that area. It's a grow space (thanks @Prom ) of about 1.2m x 2m width. I think I could probably sog about +10 plants in there maybe needing more light? I have 440w and was thinking of maybe adding a 50-100w cob if I went that route in the future.

Ok thanks. I'll keep that in mind when buying lights/upgrading in the future. Thank you so much. So the 2 of these boards (936 diodes total) would be fine for my area?

@CreX thanks for the reply. I'm a little confused, hopefully you can help clear some things up. By diodes, you mean individual leds right? If so then 234 is correct but each board is double that because that's just half of the board? I'll add a pic. I have 2 of these boards.

Awesome. I have two of them and judging from the umol output, it should be good for my size grow room? At least I hope so but obviously it depends on the amount of plants and how they're grown. Thanks for the help, much appreciated.

@Prom It's this one It's been pretty hot today and the temp has been sitting around 28 or so. I'm probably going to insulate the roof so that it controls the heat a bit better. I'm growing in an outdoor room built into the building with canvas covering. So basically a room/tent hybrid. Lol. Been difficult to control compared to a tent. But we getting there. As for the heat on the lights, I'll run another fan directly on it suggested above to see if I can get them cooler.

@Prom they're hot but not hot enough for concern I think? I can touch them for a good 20 seconds before they start to get unpleasant. If its not the lights, do you think it was the grow area that was too hot?

@Prom I'm running the 220w Hydrodepot LM301B full spectrum LED

@PsyCLown Thanks for the reply. Glad to know you're having great success with the boards. I purchased them because the stats/specs looked great compared to other similar boards(not COBS). I Started them about 25-30cm above my plants but ended up burning them. I think because of the combination of the grow room being too hot with not enough ventilation and the lights being too close. I'll try add some pictures of how they looked before versus now. I've since moved them up to around 50cm and added ventilation and better air circulation. Temps now sitting at around 27c with 40 - 50% humidity but overall much better air flow. I'm hoping I didn't stress them too much or stunted their grow. Much easier growing outdoors/stealth box lol.

Hello everyone, Thanks for all the replies. I'm very nooby with LED lights as its my first grow with them. So a little more information; I definitely didn't have enough ventilation when I started growing my plants indoors under the lights. (I germinated and started them indoors/outdoors with natural light until they were about 10cm big and then moved them under the LEDs. The room stayed around 27 - 30c with 50%-65% humidity. Definitely too much heat but humidity was ok. I had a fan on the ground and that was it. The plants looked fine for the first 2 weeks thereafter the leaves started going very yellow and shriveling up, only top leaves mind you. Which indicated to me that they were being burned by the lights as I've been using the BioBizz grow once a week and have used cal-mag substitute once. The plants were about 30cm away from the lights tho and the lights don't get very hot but the intensity of those diodes are very strong. Current setup: Room size: 2.2 m2 6 plants about 4 weeks into grow. Nutrients: BioBizz Grow, bloom, seagrow, cal-mag and co2 tabs. Medium: Natural medium from Freedom farms (Coco, perlite etc.) Lights: 2 x 220w Samsung lm301b diodes with meanwell driver currently hung about 50cm from plants. I've since added an inline extractor clearing the room air in about 2/3 min and an oscillating standing fan. The plants appear to be recovering but very slowly. Some green is coming back to the top leaves that weren't completely burned. Any other info would be much appreciated. Thank you for all the replies again. I used to be frequent on weed.co.za but it got shut down and I never joined another local forum. Glad its as friendly here as it was there.