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That's not nutrient burn. It could be lack of nutrient, but if they're still small and new to nutrient, 50 - 75% should be fine. This is only a suggestion but, are they where they can get cold? If air below ~5C is around them for too long, you can see similar patchyness with yellowing, which...

I was going to say nitrogen when I saw you say yellowing, but that doesn't look right for nitrogen - they'd be a more uniform yellow than that I'd say. So the others guys are probably on to something with their suggests of ca etc. It could be tap water. I saw something very similar on mine...

Yeah... using normal incandescents, it'll take forever and you won't get a huge amount back. HID's can be a PITA if you're just starting out and haven't got a space sorted out, but it's still worth trying to get it sorted. If it's a cash issue, get one used. You can pick them up really cheap if...

Before you plant seeds, drop them in a cup of water (tap will work) and leave them somewhere warm overnight, like near the boiler. The seed contains most of the cells the seedling will have, including a baby root and two pairs of leaves, the cotyledons. The cells are like deflated balloons...

Before you plant seeds, drop them in a cup of water (tap will work) and leave them somewhere warm overnight, like near the boiler. The seed contains most of the cells the seedling will have, including a baby root and two pairs of leaves, the cotyledons. The cells are like deflated balloons...

Yep, nutrient burning. Don't stress it, pretty much everyone's done it at some point. But you should try to sort it out. First of all, stop feeding them the nutrient you already have. Rinse the soil through with 3 - 4 x it's volume of tap water. You then want to sort out the nutrient. If...

Good luck with it buddy! Sample color = piss odor = awwwww...... nasty density = nah, i'm not touching it :mrgreen:

With 2 600's in there, you'll definitely want some cooling. With an ambient temperature of maybe 15-20C, my tent will easily go towards 30c if I zip the door up and just let the fan recirculate air. It also depends on how big your room is and if you'll be leaving the door open to the rest of...

Your wording is a bit odd, unless I've just misread it. If your pH rises, that means it's going 5, 6, 7. To correct that, you'd use pH down. It's normal for the pH to rise over a few days, it's the nutrient mix homogenizing and balancing it's self out. When you first drop the pH, you have some...

My first experience with coir. I didn't flush during the veg / extension step, but as it's starting to flower I decided to give it a rinse once a week. I put the pot in the bath and rinse the soil with 30l of tap water (the pots are about 15l). I'm judging when to stop by the color of the run...

Excellent! Glad you sorted it out.

Silence ProudlySellin! :D I can't really use CO2 because I need a high throughput of fresh air to keep my tent cool. But can offer some suggestions for those who want to try. First of all, check out used welding regulators, you can usually get them for much less. Secondly, MIG welders in...

I don't use anything for CO2 nope. My tent is all sealed up during the day while the light is on. A 250cfm fan sucks air through the cooltube my lamp is in. The walls suck in a bit and I put sheets of paper over the vents to completely block any flow through them. The only way into the tent for...

Check the pack of nutrient for a guide. If there isn't one, aim for somewhere between 6.0 and 5.5 (both are extremes, neither is best). If your using a media like coir it tends to rise in the media, so setting the feed more towards acidic (5.5) will stop nutrient being locked up in the media...

Patience young jedi. There could be a lot of things affecting the speed they'll sprout out of those blocks, like how deep they were and how tightly packed the media is. A seed is basically a mini plant in the same way an unborn baby is basically a mini human. The hull protects a seed. When it...

If it's metal, acetone will rip everything off it - I mean everything (it's a perfect solvent for THC and other resins, so it all falls away like sugar in a cup of coffee). When I ran out of green one time I rinsed mine with acetone really well, then poured the solvent over the tobacco from an...

Stretching is a light issue. I started the seedlings for my last grow under a 50w halogen lamp waiting for my stuff to arrive. By the time it finally did, a MONTH later, they were about 18 inches tall with only a couple of leaves, they were falling all over the place as if their own thc had...

It's a thought. Although I'm not sure the roots can actually absorb much, if any, CO2 directly, it'd have to get into the air and around the leaves. You might be better dissolving them in a cup in the tent / room. How much CO2 they release I'm not sure of - they might not release enough for...

Maybe not forever, but a long time. Especially if you don't get a shitty one that's close to breaking to start with. The probes measure pH by having a surface on the tip that's permeable to the H+ ions in the solution, which is what's making the solution acidic. It's permeable because it's got...

Peroxide is basically unstable - it'll break down into water and oxygen in the bottle over time even if it's just sat in the cupboard. Manufacturers will purposefully add things to it to help slow down the breakdown process. Any temperature rise above absolute zero will accelerate the process...