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Ok I think I know what cool tubes are. 20" is far enough for the light?

Ive got a single inline extractor fan (187m3/hr) is that enough. What are cool tubes? and finally how close should the light be to the plants? Thanks.

I had fungus gnats, I stopped watering for a few days and they seem to have gone. I would suggest scraping the top inch or so of soil up and replacing with sand. I was going to do this but didn't need to, playsand is the easiest as it's been cleaned etc but I had coarse, washed sharp sand which...

Pics? Do they appear to be flying out of the soil?

I think I'll add a weak solution of formulex too, BioGrow, Formulex, BioGrow, Plain Water, Repeat. Its relatively cheap and you have to buy Alg-a-mic from them. Thanks for all the help.

@asaph No I dont think it does, the bottle doesnt say anything about trace elements only NPK. Would you be able to give me a rough watering guide. Do I feed BioGrow every watering? I've just come across a bottle of Formulex Nutrient Solution. It has all the trace elements in it, will it be...

Ok I pH'd and salted it. I dropped the pH meter, need a new one :(. The EC is 193. After adding salt and biogrow. I don't think bio grow has any trace elements at all.

So what do I need to do? Should I use tap water and add 3ml per litre. What number should I get on my EC meter? Thank you so much for helping I've never had a successful grow, this has happened to a degree everytime.

I just pH and EC tested the nute solution; pH = 6.2 EC = 80 I do not understand the numbers i get from an EC meter though. There's floaty bits in the bottle I keep the mixed solution in, are they bad?

2-4ml per litre.

The LED is fine for what I need, when it blows ill think about getting another type. The problem started before I started feeding, 2 leaves began to go brown so I began the feeding. Should I up the nutes to 2ml per litre?

The grey bag is the soil, I wouldnt be suprised if it didnt have any nutes in it. The second is my plant, on the BioGrow bottle its says use 2-4 ml per litre but I used about 1ml. I did pH my water to 6, I bought bottled mineral water. Thanks for helping.

Ive started adding Bio-Grow to the waterings but it doesnt seem to be making her better. There are small flies in the soil, Im getting some sand to deal with them tomorrow. Whats wrong with her? What can I do to make her better? The purple light is from the LED in the tent. If you think more...

I dont feel the need to open a new thread so ill post the question here. I may have over watered this plant and I havent begun fertilising yet (next watering). Why are the leave starting to go brown? Id rather catch what might be wrong early. Thanks

Thanks for all the help, Hope is growing really well. It was nute burn, the shop I bought them off said "you can use that nute to start the seed off" they were wrong. Again thanks for your help.

One on the left is next to death, clearly. The one on the right I shall call Hope. Ive just watered Hope is that too much, not enough or just right?

I guessed lol. I'm giving it one last try with my final seed, just sprouted today. The one in the picture snapped yesterday, I dont have much hope for it. I hope this next one grows well. Wish me luck.

Wow, such a school boy error. Thanks everyone.

Should I continue to water with 1/4 strength Formulex (NPK = 2.4:0.9:3.4) or alternate between just water and 1/4 Formulex?

It doesnt really say anything about it on the bag. Its BAC Lava soil. Yeah... Its german.