Seedlings just popped up should I start using all three bloom Micro, Grow, Bloom as directed on back side each 1ml per 1 litter if water for seedings?
Depends what soil they’re in. If it’s organic soil (like Fox Farm), you shouldn’t need to add anything for 3-4 weeks.
Also, no matter the soil, you shouldn’t add anything to them for the 1st week. Just distilled water.
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Ah ok I’m using FF Happy Frog, so when I do start using it, use as the directions on the back or is there more to it?
Won’t need nutrients at all until at least 4 weeks from your last transplant when using HF.
The best way to know when to add nutes is to get yourself a PPM meter and then begin feeding when runoff PPM dips below 800 for the 1st time.
Welcome to the community.
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Welcome to the community. MidwestGuy has you covered. Ask any questions you have , many helpful growers. I have learned a lot about growing on this site. happy growing 
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So, I have the same soil. After about 3ish to 4 weeks, I noticed the bottom leaves start to yellow. At that point, I started with a min dose of Calmag, and only 1/4 of the recommended dosage of nutes. Slowly worked my way up but I’m still only doing half of the recommended dosage and I don’t plan to go any higher. Always best to start with a low dose, see how they react (look for yellow/burnt tips, a sign of too many nutes) As another grower once mentioned on here. The makers of the nutes want you to use more of their product so you need to buy more quickly. Almost never needed to go that high.
I got too high when I was making my water one time and added the full ‘recommended’ dose. Next day, burnt tips. Never did that again.
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I still have mine sitting out when would you recommend the tent and what light cycle?
Up to you on when to tent them honestly. You may want to get them in there sooner rather than later as you can control the environment a lot more via a tent. (RH and temp) I planted mine in their final medium (5 gallon fabric pots) inside my tent.
I’m guessing we’re talking auto flowers here so I would recommend either a 20/4 or 18/6 light cycle for autos. You don’t need to switch them to 12/12 if they’re autos either. Pretty sweet.
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Awesome thanks for the tips!!