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I've only ever used the Fox Farms line but there are several other brands that make good ferts. I'm sure you will get bombarded with great suggestions shortly.

That's calcium not mg. mg is usually much larger blotches of yellow and brown that will show up all over the leaf not on the tips like that. Calcium is always the small yellow dots like that. It's also pretty common to see those types of problems in a plant that's a month old. Calmag will...

The overwatering can cause the plant to look like it has nitrogen deficiency.

Yes. You are basically tricking your plant into thinking it has multiple tops instead of one. You can max your yield big time with this method and save yourself on a lot of head room. There are a lot of tutorials on it on youtube.

I go from red solo cups to 5 gallon when I transplant. Just need to be careful with watering is all.

When your plants are that young and in big pots it's all about building your roots and stimulating root growth. In all due time you will be dumping gallons down those pots but right now get those root hairs working on out. You will know how much you need to water by how fast it dries out...

These guys are about 2.5 weeks into flower. They aren't super tall because I LST'd and topped to keep them short. I grew them from seed at the end of December. It's okay if your pot is big. Just need to adjust your watering. When they are smaller like that pour your water around the outside...

The plant is growing up :P Even humans get a lil acne eh?

I put it in my feed. Depending on your soil you shouldn't really need to feed them nutrients yet. I start at around 4 weeks. Try holding back on all the water. Every 2-4 days is too much for a plant that young. My plants now are being watered every 4 days and they are significantly larger...

I'm having this SAME EXACT issue right now. I'm 2.5 weeks into flower on 5 WW's. I'm perfectly on par with nutes/ph levels and such with perfect environment and am having a few weird issues on leaves. It effects them all over the plant (bottom and top fan leaves) but none of them look very...

I used to do the knuckle test too but some soil just drains way better than others. I always feel the weight of the pot now.... I'd go really light on the nutes and maybe purchase some cal/mag. Stuff does wonders. I add 1 tspn with every feed now and never have any issues.

What soil are you running?

Is that a 5 gallon? I think it's fine for that size of plant. Best way to test if a plant needs water is to lift the pot. If it feels heavy at all it means you still have moisture in the bottom. I normally let my plants almost go to wilt before i water them. What type of nutes are you...

Agreed. The perlite is a weird color too which is why I asked about nutes.

I'd wait another week or two and then top back a full node or two. That way your plants have some extra time to get strong and won't suffer as much stress when you actually top it. Are you gonna LST these? Scrog? Those pots are enormous. Have fun watering those monsters.

Actually.... after zooming in on your pic, I noticed your new growth is already taking damage. What are you feeding her for nutes? What do your stems look like? Looking purplish?

Start of Week 3. Plants went back to HPS lights at 600W. Started lollipopping to keep these leafy bastards clean. Getting some great edibles off this thing already. Pics are bad with this crappy lighting... sry.

I check both in and out. Checking it from the runoff isn't very accurate but you can atleast get a picture of what your soil PH is. PH going in should always be between 6.5 and 7.0. That's all you should really be worrying about. I'm guessing your runoff is probably going to be more acidic...

Looks like Magnesium to me probably a result of bad PH.

Week 1 of Flower done. 9 to go.